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Cray

Cray is an American supercomputing brand and former company specializing in the design and manufacture of (HPC) systems, renowned for pioneering vector processing architecture and dominating the supercomputer market for decades. Founded in 1972 by engineer as Cray Research, Inc. in , the company aimed to build the world's fastest general-purpose computers, departing from Cray's prior work at where he designed the influential supercomputer in 1964. The company's breakthrough came with the Cray-1, introduced in 1976 as the first commercial vector supercomputer, featuring a distinctive C-shaped design for improved cooling and cabling, achieving peak performance of 240 megaflops and revolutionizing scientific computing for applications in weather modeling, nuclear simulations, and . Subsequent innovations included the (1982, introducing multi-processing), (1985, with liquid for 1.9 gigaflops), and (1988), which solidified Cray Research's leadership, with systems powering over half of the supercomputers by the early 1990s. In 1989, left to form Cray Computer Corporation, which developed the gallium arsenide-based Cray-3 (1993) before filing for bankruptcy in 1995; meanwhile, Cray Research was acquired by , Inc. (SGI) in 1996 for $740 million. The Cray brand was revived in 2000 when Computer Company, incorporated in 1987, acquired SGI's Cray assets and rebranded as Cray Inc., shifting focus to scalable cluster systems like the Cray XT3 (2004) and Cray XC series for . Cray Inc. expanded through acquisitions, including Appro International in 2012 for cluster expertise and Seagate's ClusterStor storage business in 2017, while developing AI-optimized systems like the Shasta platform announced in 2018. In 2019, Hewlett Packard Enterprise (HPE) acquired Cray Inc. for $1.3 billion, integrating its technology into HPE's HPC portfolio to advance exascale and AI workloads, with the Cray brand persisting under HPE for systems like the Cray EX supercomputer family. As of June 2025, HPE Cray systems occupied the top three positions on the TOP500 list of the world's most powerful supercomputers. In November 2025, HPE announced the next-generation Cray Supercomputing GX5000 portfolio, emphasizing industry-leading compute density for AI productivity and sustainable, high-efficiency supercomputing supporting global research in climate science, drug discovery, and national security.

Overview

Company profile

Cray Research, Inc. was founded in 1972 by in , initially focusing on advanced computing systems. The company, now operating as Cray Inc., maintains its headquarters at 901 Fifth Avenue, Suite 1000, in , . As a of (HPE), Cray employed approximately 1,300 people at the time of its acquisition in 2019, integrated within HPE's broader workforce. Cray's core business centers on (HPC), specializing in supercomputers, solutions, and systems designed for scientific, , and AI-driven applications. These offerings support demanding workloads in sectors such as government research, energy, and climate modeling. Financially, Cray reported revenue of $455.9 million in 2018 prior to its acquisition. Following integration into HPE in 2019, its operations contribute to HPE's HPC and AI systems, which generated $1.6 billion in revenue from AI systems during the third quarter of fiscal 2025. HPE acquired Cray for $1.3 billion in cash, establishing it as a wholly owned to enhance HPE's position in without fully merging operations. Cray's current active product lines include the HPE Cray EX series for exascale supercomputing, the HPE Cray XD systems for scalable HPC clusters, the recently announced HPE Cray GX5000 series for AI-optimized workloads, alongside the Shasta architecture underpinning these platforms.

Role in supercomputing

Supercomputing refers to the use of exceptionally powerful computer systems, often comprising thousands of interconnected processors, to perform vast numbers of calculations in parallel for solving complex scientific and engineering problems that exceed the capabilities of conventional computers. Cray has played a pioneering role in this field since the 1970s, introducing vector processing—a technique that enables simultaneous operations on arrays of data to accelerate computations—and developing scalable architectures that allowed supercomputers to handle increasingly large workloads efficiently. The company's innovations, such as those in the system, set benchmarks for high-speed and cooling technologies essential for extreme performance. As of June 2025, systems based on Cray technology, now integrated with (HPE), hold a majority of the top 10 positions on the list of the world's most powerful supercomputers, including the number-one ranked with performance of 1.742 exaflops. This positioning underscores Cray's enduring influence in delivering the highest levels of computational capability for mission-critical applications. Initially focused on niche and uses in the 1970s, such as simulations and defense modeling, supercomputing powered by Cray systems has evolved into an essential tool across diverse sectors today. Modern applications include training for , climate modeling to predict environmental changes, and drug discovery simulations to accelerate pharmaceutical development, broadening access to transformative scientific insights. In the competitive landscape, Cray/HPE differentiates itself from rivals like and through bespoke hardware designs optimized for unparalleled throughput and in high-performance environments, such as proprietary interconnects and accelerator integrations that outperform general-purpose alternatives in sustained floating-point operations. This focus on custom engineering has solidified its edge in delivering scalable solutions for demands.

History

Seymour Cray's early career (1950–1972)

began his professional career in 1950 at in , where he contributed significantly to early digital computing projects for the U.S. Navy. As a lead designer, he played a key role in developing the ERA 1103, delivered in 1953, which became the first commercially successful scientific computer and featured electrostatic storage using Williams tubes for its main memory. In its subsequent variant produced by , the system introduced , marking one of the earliest commercial implementations of this technology and enhancing reliability over prior electrostatic methods. In 1960, following ERA's acquisition by , Cray transitioned to the newly formed (CDC), co-founded by his former ERA colleague William Norris, where he focused on systems. At CDC, Cray led the design of the , introduced in 1964, widely recognized as the world's first with a peak performance of 3 MFLOPS achieved through innovative peripheral processors and a central processor optimized for scientific workloads. He followed this with the in 1969, which delivered up to 36 MFLOPS peak performance by employing advanced pipelining and unique circuit minimization techniques that reduced counts and signal propagation delays to boost clock speeds. To foster a focused environment, Cray relocated his design team to a dedicated laboratory in —his hometown—in 1963, assembling a small group of about 34 engineers who emphasized and simplicity in . This team pioneered cooling innovations, including the use of Freon-based in the to manage heat from densely packed components, preventing thermal throttling and enabling sustained high speeds. By the early 1970s, as CDC grew into a larger , Cray grew frustrated with increasing administrative oversight and bureaucracy that he felt hindered innovative design work. In 1972, he amicably departed CDC—supported by a $250,000 grant from the company—to pursue an independent venture dedicated to even faster computing systems.

Cray Research and initial supercomputers (1972–1996)

Cray Research was founded in 1972 by in , where research and development as well as manufacturing were based. The company received initial funding of $300,000 from William C. Norris, the founder of (CDC), along with a $250,000 grant from CDC itself, enabling Cray and a team of six engineers to establish the firm focused on developing advanced supercomputers. Over the next few years, additional exceeding $8 million was raised through stock offerings, supporting the design of the company's first product. The first revenue came in 1977 with the delivery of a prototype to the , marking the transition to a revenue-generating enterprise. The , announced in 1975 and first installed at in 1976, represented a breakthrough in supercomputing with its distinctive C-shaped design that minimized cable lengths to under four feet, reducing signal propagation delays. This architecture achieved up to 250 MFLOPS peak performance in short bursts and a sustained rate of 138 MFLOPS, making it the world's fastest computer at the time and up to ten times faster than competitors like the CDC 7600. Priced at $8.8 million per system, the Cray-1 saw over 80 installations worldwide by the late , primarily in government laboratories and research institutions for applications in nuclear simulations and . Building on the Cray-1's success, Cray Research introduced the in 1982, the company's first multiprocessor system featuring up to processors sharing , which enhanced for complex computations and achieved up to 800 MFLOPS in multi-processor configurations. In 1985, the followed, incorporating liquid with —a non-conductive that enabled denser packing and heat dissipation—delivering a peak performance of 1.9 GFLOPS and serving around 30 installations, though it faced challenges with limitations. The , launched in 1988, refined this lineage with up to eight processors, improved vector processing speeds reaching 2.667 GFLOPS peak, and expanded capacity, solidifying Cray's dominance in for scientific modeling. In 1989, amid internal shifts at Cray Research, departed to form Cray Computer Corporation as a , taking the Cray-3 project—which aimed to use circuits for higher speeds—with him to Colorado Springs. The Cray-3, which used circuits and operated at 500 MHz, proved prohibitively expensive due to the high cost of gallium arsenide fabrication, leading to only a few deliveries before the company filed for Chapter 11 bankruptcy in March 1995. Tragically, died on October 5, 1996, at age 71 from injuries sustained in a traffic accident near Colorado Springs.

Acquisitions and transitions (1996–2000)

In February 1996, Inc. (SGI) acquired Cray Research Inc. for $740 million, aiming to bolster its position in by integrating Cray's expertise with SGI's scalable architectures. The deal, completed in April 1996 after SGI purchased 75% of Cray's shares in a cash , faced significant integration challenges, including cultural clashes between SGI's unified engineering approach and Cray's decentralized operations across multiple sites, as well as overlapping product lines that complicated sales and management. To streamline operations, SGI promptly sold Cray's SPARC- and Solaris-based server business, including the CS6400 superserver technology, to in May 1996 for an undisclosed amount, allowing Sun to develop it into the Enterprise 10000 line. Under SGI ownership, Cray continued developing key products to bridge vector processing with scalable shared-memory systems. The Cray Origin 2000, introduced in 1996, was a shared-memory multiprocessor extending SGI's Origin line to up to 64 processors using MIPS R10000 CPUs and the Scalable Coherent Interface (SCI) interconnect, targeting mid-range supercomputing workloads. In 1998, the Cray SV1 followed as a scalable supercomputer, featuring custom processors at 300 MHz and supporting up to 32 processors in a single cabinet, designed to upgrade legacy Cray systems like the J90 and while improving price-performance for scientific simulations. By 2000, amid the dot-com bubble's pressures and SGI's broader financial difficulties, the Cray unit struggled with declining demand and integration costs, leading to efforts including plans to eliminate up to 1,500 across SGI. In March 2000, SGI agreed to sell the Cray business to Tera Computer Company for approximately $100 million in cash, stock, and assumed liabilities, a fraction of the original acquisition price. Tera completed the acquisition on , 2000, rebranding as Cray Inc. and shifting focus toward integrating its Multi-Threaded Architecture (MTA)—a fine-grained, multithreaded design for handling massive parallelism—with Cray's established and technologies to address emerging HPC needs. This transition marked the end of SGI's troubled stewardship, enabling Cray to operate independently amid ongoing market volatility.

Expansion and innovations (2000–2019)

Following the merger with Tera Computer Company in 2000, Cray Inc. refocused on developing hybrid supercomputing architectures that combined processing with massively parallel processing () capabilities. In November 2002, the company announced the Cray X1, its first major post-merger product, designed as a scalable supercomputer capable of up to 52.4 teraflops peak performance and 65.5 terabytes of memory. This system addressed demands for high-bandwidth memory access in scientific simulations, with an initial deployment secured through a $90 million contract with in October 2002. The X1 marked Cray's return to leadership in scalable , bridging legacy vector traditions with emerging MPP paradigms. In 2004, Cray introduced the Cray XT3, an Opteron-based system developed in collaboration with under the Red Storm project. Delivered on a $90 million budget, the XT3 featured a custom high-bandwidth interconnect and achieved over 40 teraflops peak performance in its full configuration, surpassing previous teraflop-scale barriers for sustained scientific workloads. This architecture emphasized Linux-based scalability and , enabling broader adoption in government and research facilities. The XT3's success laid the groundwork for subsequent generations, demonstrating Cray's expertise in integrating commodity processors with proprietary networking. Cray continued its innovation trajectory with the Cray XT5, deployed as the Jaguar system at in 2009, which reached 1.75 petaflops peak performance and claimed the title of world's fastest at the time. Building on the XT series, the XT5 incorporated 224,256 cores optimized for large-scale simulations in modeling and . By 2012, Cray advanced hybrid computing further with the Cray XK7, powering the at Oak Ridge, which integrated NVIDIA Tesla K20 GPUs alongside processors to deliver 27 petaflops peak performance. 's GPU acceleration enabled breakthroughs in energy research and , highlighting Cray's pivot toward accelerator-based architectures for diverse workloads. To bolster its market position, Cray pursued strategic acquisitions and divestitures during this period. In November 2012, the company acquired Appro International, a developer of high-density systems, for $25 million in cash, enhancing its capabilities in scalable x86-based and I/O-intensive applications. Earlier that year, in April 2012, Cray sold assets related to its high-performance interconnect technology to for $140 million, retaining usage rights while allowing Intel to integrate the technology into broader products. These moves diversified Cray's portfolio beyond core supercomputing hardware. Cray expanded into complementary areas, entering the high-performance storage market with the Sonexion 1300 in November 2011, a Lustre-based scalable designed for HPC environments starting at 50 terabytes capacity. This product addressed growing needs in simulations and , partnering with Xyratex for and networking components. Concurrently, Cray ventured into by adapting its systems for non-traditional workloads, such as and , to capture segments. By 2018, Cray reported annual revenue of $456 million, reflecting steady growth driven by government contracts and international deployments, amid a strategic emphasis on exascale computing initiatives to achieve quintillion-scale performance for next-generation scientific challenges.

Integration with HPE (2019–present)

In September 2019, Hewlett Packard Enterprise (HPE) completed its acquisition of Cray Inc. for approximately $1.3 billion in cash, marking a significant consolidation in the high-performance computing (HPC) industry. The deal, announced in May 2019, positioned HPE to enhance its HPC portfolio by integrating Cray's expertise in exascale computing and advanced architectures. HPE committed to retaining the Cray brand for its HPC offerings to maintain market recognition and customer trust in supercomputing solutions. As part of the integration, Cray's technologies were incorporated into HPE's GreenLake edge-to-cloud platform, enabling as-a-service delivery of HPC resources for hybrid environments. Post-acquisition, HPE Cray systems powered several landmark deployments, underscoring their role in advancing scientific and operational computing. In 2022, the LUMI supercomputer in Finland, built on the HPE Cray EX architecture, achieved a peak performance exceeding 550 petaflops, becoming Europe's most powerful system and supporting research in climate modeling and drug discovery. That same year, the U.S. National Oceanic and Atmospheric Administration (NOAA) deployed two HPE Cray supercomputers—Dogwood and Cactus—each delivering 12.1 petaflops of performance, tripling NOAA's prior forecasting capacity for weather, climate, and ocean predictions. By 2024, the El Capitan supercomputer, developed for the National Nuclear Security Administration (NNSA) at Lawrence Livermore National Laboratory, achieved 1.742 exaflops on the High Performance Linpack benchmark, establishing it as the world's fastest system and enabling advanced simulations for national security applications. As of November 2025, HPE Cray systems continued to dominate the list, occupying seven of the top ten positions, including the leading exascale machines like and , which reflect HPE's strengthened leadership in global supercomputing rankings. This dominance coincided with a growing emphasis on -HPC convergence, exemplified by HPE's 2025 announcements for systems like the supercomputer at , based on the HPE Cray GX5000 platform, which unifies HPC workloads with training and inference to accelerate scientific discoveries in and . Under HPE, Cray's strategic direction shifted toward sustainable computing and -hybrid models to address demands and deployment flexibility. The Slingshot-11 interconnect, integrated into HPE Cray EX systems, enhances by delivering high-bandwidth, low-latency networking with reduced power consumption, contributing to overall system sustainability in large-scale deployments like . Concurrently, HPE expanded Cray's integration with GreenLake to support hybrid models, allowing customers to scale HPC and resources across on-premises, , and public environments without compromising performance.

Products

Vector-based systems

Cray's vector-based systems pioneered high-performance computing through architectures optimized for vector processing, enabling efficient handling of large-scale scientific simulations in fields such as aerodynamics and nuclear physics. The inaugural model, the Cray-1 introduced in 1976, delivered a peak performance of 80 MFLOPS with up to 8 MB (1 million 64-bit words) of high-speed memory, marking a significant advancement in sustained floating-point operations for compute-intensive workloads. The first installation occurred at Los Alamos National Laboratory, followed by deployments at NASA centers including Ames Research Center, where it supported early supercomputing applications in aerospace research. Subsequent evolutions built on this foundation to enhance scalability and throughput. The , launched in 1982, introduced a dual-processor capable of up to 400 MFLOPS performance, doubling the computational capacity while maintaining vector processing efficiency for tasks in simulations. This was followed by the in 1988, which achieved 2.6 GFLOPS with up to eight processors and emphasized sustained performance exceeding 1 GFLOPS on real-world scientific codes, alongside the more compact Y-MP EL variant designed for smaller-scale installations with reduced memory and I/O requirements. In the late 1990s, Cray continued vector innovations with the SV1 in 1998, featuring processors clocked at 300 MHz for scalable vector operations up to 4 GFLOPS per processor, supporting shared-memory multiprocessing for engineering and research applications. The lineage culminated in the Cray X1 of 2002, a hybrid vector-scalar system integrating multi-streaming processors with a 3D torus network for distributed shared memory, enabling peak performance scaling to tens of teraflops across multi-cabinet configurations while preserving vector heritage for high-sustained FLOPS in simulations. By the 1990s, cumulative sales of these early vector systems exceeded 100 units, underscoring their widespread adoption in national laboratories and research institutions for achieving reliable, high-fidelity computational results.

Massively parallel processors

Cray's transition to massively parallel processors (MPPs) began in the mid-1990s as a response to the limitations of architectures in scaling beyond a few processors, enabling systems designed for thousands to millions of cores working in concert. The Cray T3E, introduced in 1996, marked this pivotal shift, employing a three-dimensional topology that connected up to 1,024 EV5 processors running at 300 MHz, delivering peak performance of around 600 GFLOPS; later variants scaled to over 2,000 processors at higher clocks, exceeding 1 TFLOPS. This architecture supported parallelism, allowing applications to partition workloads across nodes for enhanced scalability in scientific simulations, such as modeling and . Building on this foundation, the XT series in the expanded MPP capabilities with commodity processors and custom interconnects optimized for massive concurrency. The Cray XT3, launched in 2004 under the Red Storm project with , scaled to over 10,000 cores, achieving 10 TFLOPS in early deployments like the one at the Supercomputing (BigBen), which started with approximately 2,090 processors and was expandable over time. It utilized a lightweight kernel called Catamount, a single-image operating system derived from Sandia's efforts, which minimized overhead by running without or unnecessary services, enabling efficient execution on up to 10,000+ nodes for applications like and . The XT series evolved further with the Cray XT5 in 2007, incorporating dual quad-core processors per and the SeaStar2+ interconnect for improved bandwidth and in large-scale runs. This powered the supercomputer at , which reached 149,504 s across 18,688 s, sustaining over 1 petaFLOP for production workloads in energy research and . Catamount continued as the compute OS, supporting virtual nodes per to reduce and boost , though later XT5 installations transitioned to a tuned Cray Environment for broader software compatibility while maintaining efficiency. In the , Cray advanced with hybrid architectures in the XE6 and XK6 lines, integrating CPUs with GPUs for accelerated parallelism without sacrificing core counts. The XE6 used eight-core processors for pure CPU scaling, while the XK6 paired 16-core 6200 series CPUs with X2090 GPUs per node, enabling for data-intensive tasks. This culminated in the , an XK7 variant deployed in 2012 at Oak Ridge with 18,688 nodes featuring Interlagos Opterons and Kepler GPUs, achieving 27 petaFLOPS peak and supporting millions of effective cores through fine-grained parallelism in fields like fusion energy and . These systems exemplified Cray's focus, scaling to exascale aspirations via custom distributions like Catamount, which handled up to 300,000+ cores with low-latency messaging for sustained high-throughput simulations.

Modern HPC and AI platforms

The Cray EX series, introduced in 2019 following HPE's acquisition of Cray, represents the company's flagship line of (HPC) systems designed for exascale-era workloads. These systems integrate processors for CPU-based computing, enabling dense configurations that support massive parallelism. The Slingshot-10 and Slingshot-11 interconnects provide low-latency, high-bandwidth networking, essential for scaling across thousands of nodes in data-intensive simulations and analytics. Configurations can achieve significant per-cabinet performance, with examples like the Setonix supercomputer at Pawsey Supercomputing Centre demonstrating up to 50 petaFLOPS peak in its full configuration optimized for GPU acceleration across multiple partitions. Central to the Cray EX series is the Shasta architecture, a modular, liquid-cooled design that underpins several leading supercomputers. Shasta facilitates unified HPC and AI deployments by supporting hybrid CPU-GPU nodes in high-density cabinets, such as the EX4000 series, which can house up to 64 compute blades per unit. This architecture powered the Frontier supercomputer at Oak Ridge National Laboratory, which achieved 1.102 exaFLOPS on the High-Performance Linpack benchmark, securing the top position on the TOP500 list in June 2022 as the world's first exascale system. Similarly, the El Capitan supercomputer at Lawrence Livermore National Laboratory, based on Shasta with AMD MI300A accelerators and Slingshot interconnects, reached 1.742 exaFLOPS by November 2024, surpassing Frontier to claim the number-one ranking and advancing nuclear stockpile stewardship simulations. Integration of AI capabilities has become a core focus for modern Cray platforms, with the HPE Cray AI Development Environment providing a comprehensive software stack for distributed model training and inference. This environment leverages containerized frameworks like and , optimized for Cray's hardware to accelerate large-scale AI workloads without extensive code modifications. Systems like the European supercomputer, an HPE Cray EX deployment, exemplify this by incorporating over 11,900 AMD Instinct MI250X GPUs across its GPU partition, enabling exascale AI training for climate modeling and drug discovery. HPE's architecture supports scaling to clusters with hundreds of thousands of GPUs, as seen in planned deployments exceeding 700,000 GPU units for enterprise AI factories. Complementing compute resources, the ClusterStor E1000 storage system delivers high-throughput parallel file services tailored for HPC and data pipelines. Built on Lustre filesystem technology, it uses NVMe SSDs and HDDs in scalable units, achieving up to 85 GB/s read and 65 GB/s write aggregate throughput per 2U enclosure. Configurations can expand to 100 of usable capacity across multiple racks, supporting data-intensive tasks like genomic sequencing and real-time analytics in exascale environments.

Technological innovations

Architectural advancements

Cray's pioneering vector processing architecture in the introduced chained pipelines for floating-point operations, enabling the direct transfer of results from one functional unit to another without intermediate storage in memory. This mechanism reduced by allowing vector operations to proceed at a rate of one result per clock cycle after initial startup, optimizing throughput for scientific computations involving large arrays of data. The design featured 12 pipelined functional units, including separate pipelines for floating-point addition and multiplication, which supported concurrent execution and minimized delays in vector register operations. Innovations in cooling addressed the thermal challenges of increasing computational density, as exemplified by the 's immersion in , a non-conductive perfluorocarbon liquid circulated through the system to dissipate heat from densely packed circuit boards. This liquid allowed the to achieve higher clock speeds and performance—up to 12 times that of the —while maintaining reliability in a more compact . In modern HPE Cray EX systems, direct liquid cooling via cold plates on processors and accelerators supports rack densities exceeding 400 kW per cabinet, enabling sustained high-performance operation without reliance on . As of November 2025, the HPE Cray Supercomputing GX5000 platform advances this with 100% direct liquid cooling capable of operating at up to 40°C inlet temperatures, supporting rack power densities up to 400 kW with potential scaling to 1 MW for future and HPC workloads. Scalability was enhanced through the adoption of 3D torus network topologies in systems like the Cray T3E and XT series, which provided low-latency, bidirectional interconnects across thousands of processing elements. The T3E's 3D torus supported up to 2,176 processors with adaptive routing and virtual channels, ensuring balanced bandwidth and minimal contention as system size grew. This architecture facilitated fault-tolerant massive parallelism by incorporating features such as logical node renaming, hot-swappable components, and multiple alternate paths for data routing, allowing continued operation despite hardware failures. The XT3 extended this with a 3D torus scaling to configurations like 40×32×24 nodes, delivering high-bandwidth mesh interconnects for applications. Exascale designs advanced significantly with the Shasta architecture powering systems like , which employs modular cabinets housing 128 compute nodes each, integrated with direct liquid cooling to achieve over 1.1 exaflops of performance. This modular approach allows seamless scaling to 74 cabinets for the full system, while delivering exceptional power efficiency of 52.23 GFLOPS/W on the list, representing a 200-fold improvement over prior generations in energy use per exaflop. Building on this, the GX5000 platform, announced in November 2025, introduces multi-workload compute blades such as the GX440n (with Vera CPUs and GPUs, up to 192 GPUs per rack), GX350a ( Venice CPUs and MI430X GPUs, up to 112 GPUs per rack), and GX250 (CPU-only with up to 40 blades per rack), enabling higher compute density for exascale systems like the planned "" .

Interconnects and software ecosystems

Cray's interconnect technologies have evolved to support high-, low-latency communication in supercomputing environments, enabling efficient scaling across thousands of nodes. The SeaStar interconnect, introduced with the XT series, is a system-on-chip ASIC that integrates high-speed serial links and a 3D torus router, delivering peak bidirectional of approximately 7.6 GB/s per link with sustained performance exceeding 6 GB/s. This design balanced injection and to minimize contention in systems. Succeeding SeaStar, the Aries interconnect powered the XE and XK series, utilizing a topology for improved scalability and reduced diameter in large clusters. Aries features a high-performance ASIC with Gen3 host interface and bidirectional bandwidths exceeding 15 GB/s (7.5 GB/s per direction), supporting advanced and congestion control for HPC workloads. The interconnect, deployed in the EX series and Shasta-based systems, advances this further with 200 Gbps ports using 4-lane 56G PAM4 signaling in a 64-port switch , incorporating adaptive to optimize and support exascale topologies like Dragonfly+. Slingshot's architecture ensures low and high throughput, scaling to hundreds of thousands of nodes while integrating with Ethernet for external . As of November 2025, 400 doubles the bandwidth to 400 Gbps per port with 51.2 Tbps bi-directional capacity per 64-port switch, supporting up to 2,048 ports for the GX5000 and enhanced AI/HPC . Complementing these hardware fabrics, Cray's software ecosystems provide robust integration and optimization tools. The Cray Linux Environment (CLE), a Linux-based stack for XT and XC systems, replaced the lightweight Catamount kernel to enable broader application compatibility and I/O support while maintaining low-overhead compute node operation. CLE includes modules for libraries, compilers, and runtime environments tuned for Cray hardware. For parallel programming, Cray supported Unified Parallel C (UPC), a model that facilitates multithreading across distributed nodes via Cray compilers. Post-acquisition by HPE, the software stack transitioned toward open-source integrations, with the enhancing using Lustre for parallel file systems and other third-party components for enhanced performance and manageability. HPE Performance Cluster Manager (HPCM) serves as the orchestration layer, providing deployment, monitoring, and resource management for Cray-based clusters, including provisioning and job scheduling. As of November 2025, HPE Supercomputing Management Software further unifies these capabilities with secure, multi-tenant management, power monitoring, and lifecycle tools optimized for GX5000 systems. Cray systems support standard programming models such as MPI via the GPU-aware Cray MPICH library, for shared-memory parallelism with offload to accelerators, and for NVIDIA GPU integration in workloads. Performance analysis is facilitated by tools like CrayPAT, which captures traces and metrics for MPI, , and GPU activities to identify bottlenecks. This evolution from the proprietary UNICOS—a 64-bit UNIX for systems—to open-source ecosystems reflects adaptations to modern, demands.

Key figures

Seymour Cray

Seymour Roger was born on September 28, 1925, in , to a civil engineer father and a homemaker mother. Growing up in the small town, he displayed an early fascination with electronics, building radios and motors as a child. After graduating from Chippewa Falls High School in 1943, Cray was drafted into the U.S. Army, serving in a communications platoon with an infantry unit during the final years of . He participated in the in Europe and later supported Filipino guerrillas in the Pacific theater as a radio operator, carrying walkie-talkies and handling signal intelligence tasks. Following his discharge, Cray attended the , earning a in in 1950 and a in in 1951. Cray began his professional career in 1951 at Engineering Research Associates (ERA) in St. Paul, Minnesota, where he contributed to the design of early computers like the ERA 1103, one of the first to use Williams-Kilburn electrostatic tube memory. In 1957, he co-founded Control Data Corporation (CDC) with William Norris and others, leaving ERA to focus on scientific computing systems. At CDC, Cray led the development of influential machines, including the CDC 1604 (1959), the first transistorized computer to replace vacuum tubes entirely, and the groundbreaking CDC 6600 (1964), which introduced peripheral processors and achieved unprecedented speeds of up to 3 million floating-point operations per second. He later designed the CDC 7600 (1969), pushing performance further through innovations in circuit design and cooling. Frustrated by corporate bureaucracy, Cray left CDC in 1972 to establish Cray Research, Inc., in Chippewa Falls, Wisconsin, with a core team of former colleagues. His design philosophy prioritized speed above all else, viewing it as essential for advancing computational capabilities while maintaining simplicity and cost-effectiveness. Known as a reclusive innovator, Cray preferred working alone at night in a focused environment, often digging tunnels beneath his home as a hobby to escape distractions and foster creativity. He emphasized small, autonomous teams for rapid development, famously stating, "Designing by committee is not appropriate for computers. You pretty much need one person to say 'This is the way it’s going to be for this machine.'" This approach extended to his prototyping method, starting each project from a "blank piece of paper" to avoid preconceived constraints and enable breakthroughs. In 1989, seeking even greater independence, Cray founded Cray Computer Corporation in Colorado Springs to pursue the Cray-3, an ambitious gallium arsenide-based system aimed at gigahertz speeds, but the venture struggled with funding amid shifting market demands and filed for bankruptcy in 1995. On September 22, 1996, Cray suffered severe injuries in a car accident near Colorado Springs when his Jeep Cherokee rolled after a collision; he died two weeks later on October 5, 1996, at age 71 from complications including head trauma.

Successive leaders and engineers

Following Seymour Cray's departure from day-to-day management in 1980 to focus on advanced designs, John Rollwagen assumed leadership as CEO of , serving from 1980 until 1991 and playing a pivotal role in commercializing the through strategic marketing and expansion efforts. Rollwagen, who had joined the company in 1976 as of marketing and become in 1977, guided through its most prosperous period, growing revenues from under $40 million in 1980 to over $800 million by the late 1980s while establishing a global customer base in scientific and defense sectors. In the early 1990s, leadership transitioned amid market challenges, with John F. Carlson appointed as president and chief operating officer in 1991 under Rollwagen's chairmanship, helping stabilize operations during the shift toward multiprocessor systems. By the mid-1990s, following the 1995 acquisition of Cray Research by Silicon Graphics Inc., the company restructured, setting the stage for its 2000 as Cray Inc. For Cray Inc. in the 2000s, Peter Ungaro became CEO in 2005, leading the company through the development and deployment of the XT series, including the system that achieved exascale milestones and topped global rankings from 2009 to 2012. Ungaro, previously of sales and marketing since , emphasized scalable architectures and partnerships, driving revenue growth and positioning Cray as a leader in until his tenure ended with the 2019 acquisition by (HPE). Post-acquisition, HPE integrated Cray's operations, with Justin Hotard serving as senior vice president and general manager of the and division from 2021 to 2024. Since 2024, has led the HPC & business as Executive Vice President and General Manager of Compute, overseeing continued innovation in exascale systems and global deployments while reporting directly to HPE CEO Antonio Neri. Among key technical contributors, served as the principal architect of the , introducing vector multiprocessing in 1982 that doubled performance over prior models through and dual-processor configurations. Chen, who joined Cray Research in 1979, later extended these concepts to the Y-MP before departing in 1987 to found Supercomputer Systems Inc. Burton Smith, co-founder of Computer Company (later Cray Inc.) in 1987 and chief scientist until 2005, pioneered multi-threaded architectures as the lead designer of the Multi-Threaded Architecture () system, which eliminated caches and used fine-grained threading to handle latency in massively parallel environments. Smith's innovations, rooted in his work at Computer Company, which acquired the Cray business from SGI in 2000, influenced subsequent thread-level parallelism approaches in . Smith died on April 2, 2018. The Chippewa Falls engineering team, based in since Cray Research's founding in 1972, fostered a collaborative culture emphasizing innovation and small-team autonomy, often described as an "extremely good place to work for engineers" that produced breakthrough designs through close-knit dynamics and minimal bureaucracy. Post-2000, as Cray Inc. expanded internationally with R&D centers in , , and additional U.S. sites, the workforce grew more diverse, incorporating global talent in software, interconnects, and AI to support distributed development across time zones and expertise areas.

Impact and legacy

Scientific and industrial contributions

Cray supercomputers have significantly advanced climate and weather modeling by providing the computational power necessary for higher-resolution simulations. The National Oceanic and Atmospheric Administration (NOAA) deployed twin HPE Cray supercomputers, Dogwood and Cactus, each delivering 12.1 petaflops, in 2022, which tripled the agency's operational weather and climate computing capacity compared to prior systems. These systems enabled upgrades to the U.S. Global Forecast System (GFS) and the introduction of the Hurricane Analysis and Forecast System (HAFS) for the 2023 hurricane season, allowing for more accurate predictions of storm paths and intensities by resolving small-scale atmospheric features like thunderstorms at finer grid resolutions. In the nuclear and energy sectors, Cray systems have supported critical simulations for under the National Nuclear Security Administration's (NNSA) Advanced Simulation and Computing (ASC) program. At (ORNL), the Cray XK7 , operational from 2012 to 2019, facilitated high-fidelity 3D simulations of nuclear weapons effects, enabling (LANL) researchers to assess weapon performance without physical testing. These simulations advanced understanding of material behaviors under extreme conditions, contributing to the reliability of the U.S. nuclear stockpile while supporting energy research on and . Similarly, LANL's Cray XC40-based has been integral to ASC efforts, performing multiphysics simulations that integrate hydrodynamics, radiation transport, and material properties for stewardship applications. Cray's hybrid architectures have accelerated biomedical research, particularly in through enhanced simulations. Titan's Kepler GPUs enabled large-scale runs using software like NAMD, allowing scientists to model protein structures and interactions at unprecedented scales, which is essential for identifying potential targets. For instance, these capabilities supported simulations of complex biomolecular systems, reducing the time required to predict protein conformations and screen compounds, thereby expediting the development of therapeutics for diseases like cancer and Alzheimer's. The deployment of Cray supercomputers has delivered substantial economic impacts across industries by optimizing R&D processes and reducing reliance on expensive physical prototypes. In the automotive sector, utilized Cray systems in the for full- crash simulations, replacing costly physical tests that could exceed $500,000 per prototype with virtual models comprising thousands of finite elements. This shift has enabled billions in cumulative R&D savings industry-wide by shortening design cycles and improving safety without multiple hardware iterations.

Notable achievements and installations

Cray supercomputers have demonstrated sustained dominance on the list of the world's fastest systems since its inception in 1993, with multiple instances of claiming the number one position across various lists. For example, the Cray XT5-based system at (ORNL) achieved the top ranking in November 2009, marking the first time a Cray system led the list in its modern history. More recently, as of June 2025, the HPE Cray EX-based El Capitan at (LLNL) for the (NNSA) holds the number one spot with a performance of 1.742 exaFLOPS on the High-Performance Linpack (HPL) , while at ORNL ranks second at 1.35 exaFLOPS. at , another HPE Cray EX system, occupies third place with 1.01 exaFLOPS. Cray systems have earned several prestigious awards recognizing breakthroughs in high-performance computing. In 2008, researchers at ORNL received the ACM Gordon Bell Prize in the Peak Performance category for achieving record-breaking speeds on the Cray XT4/XT5 Jaguar supercomputer, demonstrating over 1.76 petaFLOPS in plasma physics simulations. Earlier wins include the 1989 Gordon Bell Prize awarded to a Boeing and Cray Research team for parallel processing advancements on the Cray-2, and multiple entries in 1993 for applications on the Cray C90. Additionally, the IEEE established the Seymour Cray Computer Engineering Award in 1997 to honor innovative contributions to high-performance computing in his name. Key installations of Cray systems span decades and global sites, underscoring their widespread adoption in research and defense. In the 1970s, the inaugural was deployed at in 1976, followed by installations at LLNL and other U.S. Department of Energy (DOE) facilities, revolutionizing computational capabilities for nuclear simulations. By the 2020s, deployments expanded internationally, including at the CSC-IT Center for Science in , an HPE Cray EX system ranking ninth on the June 2025 list with 380 petaFLOPS, supporting European scientific research across climate modeling and medicine. In the U.S., Aurora's 2025 full activation at Argonne advanced materials science and AI workloads. Over the years, Cray has deployed systems to more than 100 major institutions worldwide, including national labs and universities. In 2024, the NNSA unveiled at LLNL, highlighting Cray's role in for applications like . HPE Cray platforms have also excelled in AI benchmarks, with collective performance across top systems exceeding 5.75 exaFLOPS in the November 2024 performance share, enabling advancements in and data-intensive simulations.

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