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Press Release

RACKABLE SYSTEMS EXPANDS OFFERINGS WITH NEW LINE OF DUAL-CORE AMD OPTERON™ PROCESSOR MODELS 880 AND 280

- Leading Data Center Server and Storage Provider Offers High Efficiency Servers
with Next Generation of Dual-Core Technology -

MILPITAS, CALIF. – September 26, 2005 – Rackable Systems, Inc. (Nasdaq: RACK), a leading provider of servers and storage products for scale out data center deployments, today announced the adoption of the newest Dual-Core AMD Opteron™ processors, Models 880 and 280 with Direct Connect Architecture. Available across Rackable Systems' line of thermally efficient 1U, 2U, 3U, 4U and hybrid blade server designs, the newest evolution in AMD64 dual-core processor technology will offer improved performance-per-watt within platforms based on the existing 95-watt power infrastructure. The Dual-Core AMD Opteron Model 180 processors will be integrated into Rackable Systems' server designs next month when they are released.

"We've seen tremendous customer traction with AMD's dual-core technology," said Giovanni Coglitore, chief technology officer at Rackable Systems. "We recently won an award for building the World's Most Efficient Server using the Dual-Core AMD Opteron processor, and we know customers will appreciate the improved performance with the newest additions to Rackable Systems' product offerings."

As one of the world's largest providers of AMD Opteron processor-based servers, all Rackable Systems products are based on an open architecture approach, offering total component choice and flexibility across the full suite of AMD Opteron processors. Known for its award-winning, thermally efficient designs, Rackable Systems' servers achieve extremely high density levels and performance without compromising cooling and reliability.

"Data centers running servers from Rackable Systems are among the first deployments to experience the industry-leading performance and energy savings of Dual-Core AMD Opteron processors with Direct Connect Architecture," said Ben Williams, vice president, Commercial Business, AMD (NYSE: AMD). "We salute Rackable Systems for bringing leading-edge platforms to market quickly to address the escalating performance and efficiency requirements of customers in demanding data center and storage environments."

About Rackable Systems
Rackable Systems, Inc. (Nasdaq: RACK) is a provider of servers and storage products for scale out data center deployments. The company's servers are designed to provide benefits in the areas of density, thermal efficiency, serviceability, power distribution and remote management. Founded in 1999 and based in Milpitas, California, Rackable Systems serves Internet, semiconductor design, enterprise software, federal government, entertainment, financial services, oil and gas exploration and biotechnology customers worldwide.

To learn more about Rackable Systems, go to www.rackable.com, call 408-240-8300, or write to info@rackable.com.

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