Rambus Signs Patent License Agreement with NEC Electronics

Agreement includes DDR2 memory controllers as well as future Rambus innovations

Los Altos, CA - April 14, 2005 –   Rambus Inc. (Nasdaq:RMBS), one of the world's premier technology licensing companies specializing in high-speed chip interfaces, today announced it has signed a patent license agreement with NEC Electronics Corporation that allows the development and manufacture of memory controllers based on various Rambus innovations.

The agreement is for a five-year term, with the possibility of renewal or extension. The license's scope covers memory controllers compatible with SDR, DDR and DDR2 SDRAM as well as future memory controller innovations. Rambus will receive royalties on sales of licensed products.

"This agreement with one of the world's leading chip providers showcases the value of our patent portfolio," said Harold Hughes, chief executive officer at Rambus. "We have enjoyed a long and lasting relationship with NEC Electronics and look forward to the continued collaboration with their engineering teams to help bring new and advanced products to the market."

Since its founding in 1990, Rambus has focused on advancing electronic system performance through innovations in logic and memory interfaces, controller architectures, and system design. The result is a broad portfolio of innovations and patents that enables semiconductor manufacturers and system designers to achieve ever-increasing levels of functionality and performance, to lower system costs, to mitigate risk with silicon-proven designs, and to reduce time to market. For more information on Rambus's patent portfolio, please visit www.rambus.com/products/innovationslicensing.

About Rambus Inc.

Rambus is one of the world's premier technology licensing companies specializing in the invention and design of high-speed chip interfaces. Since its founding in 1990, the company's innovations, breakthrough technologies and integration expertise have helped industry-leading chip and system companies solve their most challenging and complex I/O problems and bring their products to market. Rambus's interface solutions can be found in numerous computing, consumer, and communications products and applications. Rambus is headquartered in Los Altos, California, with regional offices in Chapel Hill, North Carolina; Bangalore, India; Taipei, Taiwan; and Tokyo, Japan. Additional information is available at www.rambus.com.

Rambus is a registered trademark of Rambus Inc. Other trademarks that may be mentioned in this release are the intellectual property of their respective owners.

This release contains forward-looking statements under the Private Securities Litigation Reform Act of 1995, such as the statement related to the possible effect that upfront licensing fees and royalty payments could have on Rambus's 2005 revenues and as to the beneficial nature of the extended agreement. Such forward-looking statements are based on current expectations, management's beliefs, and certain assumptions made by the Company's management. Actual results may differ materially. Among the reasons that could cause actual results to differ materially are: NEC's sales, strength of the DRAM market, strength of the memory controller market and other factors that are described more fully in our SEC filings including our 10-K and 10-Qs.

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