Rambus Updates Second Quarter Guidance

Los Altos, California, United States  - June 22, 2009 - Rambus Inc. (NASDAQ:RMBS), one of the world’s premier technology licensing companies specializing in high-speed memory architectures, announced today that it has updated its guidance for the quarter ending June 30, 2009. The Company revised its guidance for revenue and expenses for the quarter. The Company expects revenue for the quarter to be between $26.7 million and $27.2 million. Adjusted operating expenses for the quarter, excluding stock-based compensation expenses and any stock-based compensation restatement expenses or benefits, are expected to be between $42 million and $45 million, which includes litigation expenses between $15 million and $17 million. Rambus initially provided revenue guidance for the quarter in the range of between $27 million and $30 million. Rambus also initially provided adjusted operating expenses guidance for the quarter, excluding stock-based compensation expenses and any stock-based compensation restatement expenses or benefits, of $43 million to $48 million, which included litigation expenses in the range of between $12 million and $16 million.

“Our updated guidance reflects the impact of the current macro-economic situation and its effect on the sales of semiconductors and consumer electronic systems,” said Harold Hughes, president and chief executive officer at Rambus. “We continue our goal of managing expenses on a conservative basis, but also continue to incur legal expenses which vary depending on developments in cases or the actions of our litigation opponents.”

About Rambus Inc.

Rambus is one of the world's premier technology licensing companies specializing in the invention and design of high-speed memory architectures. Since its founding in 1990, the Company's patented innovations, breakthrough technologies and renowned integration expertise have helped industry-leading chip and system companies bring superior products to market. Rambus' technology and products solve customers' most complex chip and system-level interface challenges enabling unprecedented performance in computing, communications and consumer electronics applications. Rambus licenses both its world-class patent portfolio as well as its family of leadership and industry-standard interface products. Headquartered in Los Altos, California, Rambus has regional offices in North Carolina, India, Germany, Japan, Korea and Taiwan. Additional information is available at www.rambus.com.