RACKABLE SYSTEMS NAMED "COOL VENDOR" BY LEADING ANALYST FIRM

Vendors selected for the "Cool Vendor" report are innovative, impactful and intriguing

MILPITAS, Calif., April 20, 2006 – Rackable Systems, Inc. (Nasdaq: RACK), a leading provider of servers and storage products for large-scale data centers, today announced it has been included in the list of "Cool Vendors" in the "Cool Vendors in Emerging Technologies, 2006" report written by Martin Reynolds, Jeffery Hewitt, Christopher H. Baum and Jackie Fenn and published on March 30, 2006 by Gartner, Inc.

According to the report, scalability is the next great IT challenge for every aspect of IT operations. Data centers are exceeding their power and cooling capabilities; servers — virtual and real — are proliferating at a rate only exceeded by the available hardware processing units to run them. The server arena has grown to more than a $50 billion worldwide market, annually representing about 7 million server shipments. More than 90 percent of those shipments are x86-based, and with that many new servers being installed every year, the focus has turned to the amount of power they consume in a data center and how much heat they produce. The larger the end customer, the more concern there is about wattage drain and thermal output.

Rackable Systems' innovative server designs, superior cooling technologies and DC power options enable the company to offer customers highly dense deployments while increasing efficiency and simultaneously reducing power costs.

"We are honored to receive this recognition by Gartner," said Tom Barton, President and CEO of Rackable Systems. "We believe the 'Cool Vendor' designation reflects our ongoing commitment to provide our customers with server and storage solutions that meet the real-life needs of today's most complex data centers."

About Gartner's Cool Vendors Selection Process
Gartner's listing does not constitute an exhaustive list of vendors in any given technology area, but rather is designed to highlight interesting, new and innovative vendors, products and services. Gartner disclaims all warranties, expressed or implied, with respect to this research, including any warranties of merchantability or fitness of a particular purpose.

Gartner defines a cool vendor as a company that offers technologies or solutions that are: Innovative, enabling users to do things they couldn't do before; Impactful, have, or will have, business impact (not just technology for the sake of technology); Intriguing, have caught Gartner's interest or curiosity in approximately the past six months.

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 visit www.rackable.com.

Contact Information:

Rackable Systems Colette LaForce 408-240-8324 claforce@rackable.com

Schwartz Communications, Inc. Dara Sklar 415-512-0770 rackablesystems@schwartz-pr.com

Rackable Systems is a registered trademark of Rackable Systems®, Inc. All other trademarks are property of their respective holders.