Global supercomputer leader Cray Inc. (NASDAQ: CRAY) today announced that Pittsburgh Supercomputing Center (PSC) will double the capacity of its 10-teraflops (10 trillion floating point operations per second) Cray XT3™ system to over 21 teraflops by the end of this year. Nicknamed "BigBen," PSC's system was the first Cray XT3 supercomputer to be installed and became the leading performer among tightly coupled supercomputer architectures on the National Science Foundation's TeraGrid computing infrastructure. The upgrade is expected to significantly boost the TeraGrid's ability to support the most demanding, large-scale scientific applications -- known as "capability" computing.

PSC will replace the single-core AMD Opteron™ processors in BigBen with dual-core Opteron processors, boosting peak performance and also increasing system memory from two to four terabytes. Dual-core technology fits two processor cores on a single die to double processing capacity with minimal impact on power consumption and heat levels.

"The Cray XT3 system has proven itself as a massively parallel platform of exceptional capability," said PSC scientific directors Michael Levine and Ralph Roskies in a joint statement. "In the first year since becoming a production resource, BigBen has made possible a number of remarkable achievements. In fact, the system has been in such demand among scientists that it is now the most oversubscribed computing resource on the TeraGrid. We look forward to more new insights into important scientific problems as a result of this upgrade."

"The Cray XT3 supercomputer has been designed to use innovative packaging technology that allows customers to upgrade their systems cost-effectively," said Peter Ungaro, Cray president and CEO. "This upgrade will increase both the performance and capability of BigBen, lowering total cost of ownership by extending the system's productive life. This will make it even more valuable to PSC and scientific research groups throughout the country."

About Pittsburgh Supercomputing Center

PSC provides university, government and industrial researchers with access to several of the most powerful systems for high performance computing, communications and data-handling available to scientists and engineers nationwide for unclassified research. The center is a joint effort of Carnegie Mellon University and the University of Pittsburgh, together with Westinghouse Electric Company. Established in 1986, PSC is supported by several federal agencies, the Commonwealth of Pennsylvania and private industry, and is a leading partner in the TeraGrid, the National Science Foundation's open scientific discovery infrastructure combining leadership class resources at nine partner sites to create an integrated, persistent computational resource. Go to www.psc.edu for more information.

About the Cray XT3 Supercomputer

The Cray XT3 supercomputer is the third-generation massively parallel processor (MPP) system. Purpose-built to deliver exceptional sustained application performance for challenging scientific and engineering problems, the Cray XT3 system has set new performance records for systems equipped with standards-based processors. The supercomputer's high-speed 3D torus interconnect, advanced MPP operating system and high-speed global input/output make it possible for users to scale applications from 200 to more than 30,000 processors without performance loss. The system's scalable processing element uses x86 64-bit AMD Opteron single- or dual-core processors that employ HyperTransport™ technology to increase bandwidth and reduce latency. The Cray XT3 supercomputer was named 2005 Product of the Year by Scientific Computing & Instrumentation. Go to www.cray.com/products/CrayXT3 for more information.

About Cray Inc.

As a global leader in supercomputing, Cray provides highly advanced supercomputing systems and world-class services and support to government, industry and academia. Cray technology enables scientists and engineers to achieve remarkable breakthroughs by accelerating performance, improving efficiency and extending the capabilities of their most demanding applications. Cray's Adaptive Supercomputing vision will result in innovative next-generation products that integrate diverse processing technologies into a unified architecture, allowing customers to surpass today's limitations and meeting the market's continued demand for realized performance. Go to www.cray.com for more information.

Safe Harbor Statement

This press release contains forward-looking statements. There are certain factors that could cause Cray's execution plans to differ materially from those anticipated by the statements above. Among these are the technical challenges of developing high performance computing systems, including potential delays in development projects; Cray's ability to scale the system to the targeted level of performance; reliance on third-party suppliers, including delays in availability of parts from suppliers; timing of and successful porting of application programs to new computing systems; and successful passing of acceptance tests. For a discussion of these and other risks, see "Risk Factors" in Cray's most recent Quarterly Report on Form 10-Q filed with the SEC.

Cray is a registered trademark, and Cray XT3 is a trademark, of Cray Inc. Opteron is a trademark of Advanced Micro Devices, Inc. HyperTransport is a licensed trademark of the HyperTransport Technology Consortium. All other trademarks are the property of their respective owners.