Purpose-built for demanding high-performance computing (HPC ) applications
used in areas such as computational chemistry, environmental forecasting
and computer -aided engineering, the Cray XD1 system lets users simulate,
analyze and solve complex problems more quickly and accurately. Building on years of experience in designing,
developing, marketing and servicing the world's most advanced supercomputers,
Cray offers a comprehensive portfolio of HPC systems that deliver unrivaled,
sustained performance on a wide range of applications. Cray is a registered trademark, and
Cray XD1, Cray XT3, Cray X1E and Cray X1 are trademarks of Cray Inc.

About PBS Professional
PBS Professional is the commercial version of the Portable Batch System
(PBS), originally developed to manage aerospace computing resources at the
NASA Ames Research Center.

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Ammasso's patent-pending technology powers the industry's
first RDMA-enabled Ethernet adapter , enabling highly scalable cluster
applications.
Engineers and scientists who utilize PBS Professional are more productive,
because they can focus their attention on their analyses, rather than on the
need to remember various application- and operating systems-specific job
control languages.

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"
"In today's rapidly changing IT environment, customers are seeking
computing infrastructure solutions which enable the simple migration of new
applications and I/O traffic patterns onto their existing network
infrastructures," said Matt Eastwood, Program Vice President, IDC.

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"The HP-MPI library provides transport
independence for cluster applications, and with the addition of compatibility
with Ammasso 's innovative, low-latency Ethernet adapter, our HP-MPI users gain
a valuable option for High Performance Technical computing over Ethernet
networks. "All of our
Cray supercomputers, including the Cray XD1 and Cray XT3 systems, were
designed to accommodate higher density dual-core processors in order to
leverage our customers' investment in these systems.

About Cray Inc."
"Cray's HPC customers demand a robust workload management solution that
can extend across their heterogeneous computing environments," said Amar Shan,
Cray XD1 product manager.cray.altair.

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HP-MPI is a high-performance, production-quality implementation of the MPI
standard for HP servers and workstations .
Global supercomputer leader Cray Inc. "Our Cray XD1 system has 144
2.

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Remote Direct Memory
Access (RDMA) streamlines sharing of server memory and allows applications to
scale across physical servers more efficiently by reducing latency, memory
copies and CPU utilization."

Pricing and Availability
The Ammasso 1100 version 1. The Cray XT3
supercomputer, based on the Sandia Red Storm massively parallel processor
(MPP) system design, can operate with more than 60,000 processor cores --
delivering up to 269 teraflops (269 trillion FLOPS), an increase of 109
teraflops over single-core devices.
(Nasdaq: CRAY), the global supercomputing leader, announce the release of
Altair 's PBS Professional(TM) workload management solution on the Cray XD1(TM)
supercomputer. This solution simplifies system administration and allows users to
focus on their applications.

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Founded in 2002 , Ammasso is
privately held and based in Boston, MA.
Building on years of experience in designing , developing, marketing and
servicing the world's most advanced supercomputers, Cray offers a
comprehensive portfolio of HPC systems that deliver unrivaled sustained
performance on a wide range of applications .
Additionally, it has provided us with one common workload manager across our
entire heterogeneous supercomputing center.

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ammasso.

2 GHz AMD Opteron(TM) CPU processors, with a capacity of 634 gigaFLOPS -- a
real workhorse in our facility. This innovative tool helps
them simulate and analyze faster , as well as solve more complex problems and
bring solutions to market sooner. Founded in 1985 and privately held with offices
throughout 13 countries, Altair's unparalleled knowledge and expertise in
product development and manufacturing extend throughout North America, Europe
and Asia.

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Ammasso is a trademark of Ammasso, Inc."

Cray XD1 Supercomputer

Dual-core processors allow Cray to achieve very high density in both the
Cray XD1 and Cray XT3 supercomputers. The Cray XT3 supercomputer's high speed 3D torus interconnect,
x86 64-bit AMD Opteron processors, high speed global I/O, and advanced
MPP operating system ensure that applications scale steadily from 200 to
more than 30,000 processors without performance losses from communications
bottlenecks, asynchronous processing, or memory access delays. These include reliance on
third-party suppliers, the technical challenges of developing high
performance computing systems including stable system software, government
support for and timing of supercomputer systems purchases, the successful
porting of application programs to Cray computer systems, Cray's ability to
keep up with rapid technological change and Cray's ability to compete
against larger, more established companies and innovative competitors. It does so by aggregating computation resources into
a virtual pool and intelligently scheduling their computational workload .

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Ammasso 1100 RDMA over Ethernet Adapter Added to HP-MPI List of Compatible
Interconnects

BOSTON, Ammasso, Inc. Prior to general availability of the Ammasso
1100, the world's first RDMA over Ethernet Adapter, RDMA was only available on
specialized system-area networks such as Infiniband.

"With our strong collaboration with AMD, we have already performed
successful early testing of the Dual-Core AMD Opteron processors on the
Cray XD1 system on a range of applications and are excited to be rolling
them out to our customers," said Cray president Peter Ungaro.

Altair and Cray Extend PBS Professional Integration to Cray's XD1 Supercomputer

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Investors include Prism Venture
Partners, CDP Capital -Technology Ventures, Inflection Point Ventures and
Velocity Equity Partners.

Direct-connect system architectures of the Cray XD1 system and the Cray XT3
system speed high-performance computing (HPC) applications by directly
linking processors, memory and I/O resources instead of using a
conventional PCI bus.

About the Cray XT3 Supercomputer

The Cray XT3 Supercomputer is the third generation massively parallel
processor (MPP) system from Cray -- purpose-built to offer scientists and
engineers a high performance computing system that delivers exceptional
sustained application performance to handle their most challenging
problems .

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"We are pleased to announce HP-MPI library support of the Ammasso 1100
RDMA over Ethernet Adapter," said Bruce Toal, director of marketing, High
Performance Computing Division, HP.2 adapter is available now at a list price of
$495.com. AMD's (NYSE: AMD) cutting-edge
32- and 64-bit dual -core technology fits two processor cores on a single
die, giving users of these Cray systems double the processing capacity in
the same amount of space with minimal increases in power consumption and
heat levels. As a result, customers
who choose the dual-core option will enjoy improved price /performance,
while continuing to see exceptional sustained application performance
without the need to modify their applications.2 teraflops., and SEATTLE, Altair Engineering Inc. The company's grid computing software, PBS
Professional(TM), is a workload management solution for HPC environments ,
Linux clusters and desktop cycle harvesting that delivers an ROI within one
year.

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As the global leader in HPC, Cray provides innovative supercomputing
systems that enable scientists and engineers in government, industry and
academia to meet both existing and future computational challenges . There are certain
factors that could cause Cray's execution plans to differ materially from
those anticipated by the statements above. Designed to meet the requirements of
highly demanding HPC applications in fields ranging from product design to
weather prediction to scientific research, the Cray XD1 system is an
indispensable tool for engineers and scientists.

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"Customers
are increasingly deploying scale-out computing infrastructures for a wide
variety of applications.

PRESS RELEASE Cray to Offer Supercomputers With Dual-Core AMD Opteron Processors

Cray is a registered trademark, and Cray XD1 and Cray XT3 are trademarks of
Cray Inc."
PBS Professional enables customers in government , life sciences, energy,
research, logistics, manufacturing and finance to optimize the utilization of
their HPC environments.

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About Ammasso
Ammasso provides industry-leading IT professionals with advanced network
protocol acceleration to ensure unparalleled price-performance, availability
and manageability of their next-generation computing and storage
architectures. Current applications include high performance technical
computing, grid computing and IP storage.

About the Cray XD1 Supercomputer

The Cray XD1 supercomputer combines direct-connect system architecture,
HPC -optimized Linux, management and reconfigurable computing technologies
to deliver industry-leading performance on real-world applications.

Safe Harbor Statement

This press release contains forward-looking statements.

About Cray Inc. PBS Professional is the leader in high-performance
workload management and the de facto standard for batch queuing on Linux
clusters.

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"
The Ammasso 1100 RDMA over Ethernet Adapter accelerates cluster
applications over standard gigabit Ethernet networks.
This technology enables customers and independent software vendors (ISVs) to
effortlessly make their applications available on the newest HP-MPI supported
Linux-based interconnect technologies . One Cray XD1 cabinet provides 288 AMD
Opteron 200 Series processor cores, boosting its computing capability from
the 744 gigaflops (744 billion calculations per second) available with
single -core processors to more than 1. AMD, AMD Opteron and combinations thereof are trademarks of
Advanced Micro Devices, Inc. OEM agreement includes PBS Professional deployment on
Cray X1E, Cray XT3 and Cray XD1 Systems

TROY, Mich.,
a global leader recognized for innovative product development, advanced
engineering software and grid computing technology, and Cray Inc. The addition of
PBS Professional software to the Cray XD1 platform demonstrates both parties'
commitment to meeting the needs of the high-performance computing (HPC) user
community . When customers use PBS
Professional with the Cray XD1 system, they'll be able to link workload
management with Active Manager's automated configuration and monitoring
features."
The Cray XD1 supercomputer combines breakthrough interconnect, management
and reconfigurable computing technologies to meet user demand for exceptional
performance, reliability and usability. Go to
http: //www.

About Altair Engineering
Through product design consulting, advanced engineering software and high-
performance computing technologies, Altair Engineering increases innovation
for clients around the globe.

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Ammasso Ethernet Networking Solution to Support HP Message Passing Interface Library

Ammasso and HP teamed to do the testing and verification and can now
provide seamless scalability for HP customers operating in high performance
technical computing (HPTC) cluster and grid environments.com. (NASDAQ: CRAY) today announced that Dual-Core AMD Opteron processors will be
available as an option on Cray XD1 supercomputers in July 2005, and on
Cray XT3 supercomputers later in 2005. The
x86-based Cray XD1 system supports a broad range of 32- and 64-bit HPC
applications on AMD Opteron single- or dual-core processors.
"The Alabama Supercomputer Center has been running PBS Professional on our
Cray XD1 system for several months now," said Wayne Whitmore, Alabama
Supercomputer Center chief operating officer.

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As the developer of Altair(R) HyperWorks(R) - The Engineering
Framework for Product Design(TM), Altair is the leading provider of high-end,
open CAE software solutions for modeling, visualization, optimization and
process automation.

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Go to www.cray.com .

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"As
dual-core AMD64 technology is also based on AMD's Direct Connect
Architecture, it continues to eliminate processor , memory and I/O
bottlenecks, while enhancing overall performance for HPC applications.

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HP-MPI for Linux supports multiple
interconnects so that customers can build a single executable that
transparently takes advantage of the supported high-performance interconnects. All other trademarks are the
property of their respective holders. PBS Professional has been fully integrated with Cray's Active
Manager software, which automates system monitoring, control and configuration
to simplify administration and increase system availability. PBS Professional workload management technology is now available
for purchase on Cray's full product line, which includes the Cray X1E(TM),
Cray XT3(TM) and Cray XD1 supercomputers. "We are very excited to offer them a powerful
solution that integrates PBS Professional with the Cray XD1 Active Manager
system administration and management features. "Customers can integrate Cray XD1 systems into their HPC
environments and maintain a consistent PBS Professional interface across their
entire infrastructure.

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, the leading provider of
RDMA over Ethernet networking solutions for server-to-server applications
today announced that its Ammasso 1100 RDMA over Ethernet Adapters have been
tested and verified to be compatible with the HP Message-Passing Interface
(MPI) software library.
"We are excited that the Ammasso 1100 has been established as compatible
with the HP-MPI library," said Alan Litchfield, CEO of Ammasso. "The library
will greatly simplify deployment of applications on clusters interconnected
with Ammasso adapters, which offer significantly lower total cost of ownership
as compared to alternative specialized interconnect solutions. More information is available at
http://www.

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These architectures ensure that sophisticated
software can take full advantage of all the available processing power as
more processors are added to the system."

"Cray has helped prepare the way for the next stage in processor evolution
by designing the Cray XD1 and the Cray XT3 supercomputers to take advantage
of Dual-Core AMD Opteron processor performance ," said Ben Williams, vice
president of Commercial and Server/Workstation business at AMD. For
a discussion of these and other risks, see "Factors That Could affect
Future Results" in Cray's Annual Report on Form 10-K for the year ended
December 31, 2004, filed with the Securities and Exchange Commission. All other trademarks are the property of their
respective owners.com for more information .

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The majority of these clusters are built using
Ethernet technology and RDMA-enabled Ethernet clusters allow users to achieve
additional performance using their existing network infrastructure. For product and ordering information, go to
sales@ammasso.
"Altair is pleased to extend our strong relationship with Cray to include
the Cray XD1 system," said Michael Humphrey, vice president of Enterprise
Computing at Altair. In doing so, they can shorten deployment time and
increase user productivity.

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The 10 ,000 processor Cray XT3
supercomputer installed at Sandia National Laboratories is the largest
Opteron processor-based system in the world.com for more
information. PBS Professional has allowed us to
efficiently and reliably manage the workload on this large compute resource.
As the global leader in high performance computing, Cray provides
innovative supercomputing systems that enable scientists and engineers in
government, industry and academia to meet both existing and future
computational challenges. For detailed information about Altair, visit http://www.

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Altair and Cray Extend PBS Professional Integration to Cray's XD1 Supercomputer

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PRESS RELEASE Cray to Offer Supercomputers With Dual-Core AMD Opteron Processors

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Ammasso Ethernet Networking Solution to Support HP Message Passing Interface Library

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