Rambus Achieves 500th Patent Milestone; Recent Patent Awards Include Innovative FlexPhase(TM) Circuit Technology

LOS ALTOS, Calif.--June 2, 2006--Rambus Inc. (Nasdaq:RMBS), one of the world's premier technology licensing companies specializing in high-speed chip interfaces, today announced that it has been granted its 500th patent from the U.S. Patent and Trademark Office, and foreign patent offices. Rambus' growing patent portfolio includes fundamental inventions in the area of memory design, high-speed interfaces, package layout, and system design. One such invention recently awarded United States Patent 6,675,272 is used in Rambus' FlexPhase(TM) circuit technology. FlexPhase eliminates trace-length matching and corrects for timing mismatches in complex circuit designs, and was first demonstrated in Rambus' XDR(TM) memory architecture.

"Rambus has advanced the state-of-the-art in memory architectures and high-speed signaling for the past 16 years, achieving an industry-leading portfolio of patented inventions," said Kent Richardson, vice president of Intellectual Property at Rambus. "Reaching the milestone of our 500th patent is a testament to the passion for innovation of Rambus scientists and engineers, and to the ongoing commitment of the company to fundamental research and development."

Rambus' portfolio of patented inventions in the area of high-speed signaling includes those underlying all modern DRAM memory products and their associated memory controllers. Rambus innovations have been incorporated into virtually all digital electronics products including personal computers, video game consoles, digital TVs and digital set-top boxes. As signaling speeds continue to rise, Rambus innovations will become increasingly critical to delivering breakthrough levels of performance.

Rambus now has 500 issued and over 480 pending patents. For more information on Rambus's patent portfolio, 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 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 and Taiwan. Additional information is available at www.rambus.com.