Rambus Unveils Next Generation XDR(TM) Memory Interface; 8GHz XDR2 DRAM with Micro-Threading Enables Unprecedented Graphics Capabilities

TOKYO—(BUSINESS WIRE)—July 7, 2005— Rambus Inc. (Nasdaq: RMBS), one of the world's premier technology licensing companies specializing in high-speed chip interfaces, today announced the latest version of its high-bandwidth XDR memory interface technology, named XDR(TM)2. The XDR2 memory interface uses a micro-threaded DRAM core and circuit enhancements that enable data rates starting at 8GHz, making it five times faster than today's best-in-class GDDR graphics DRAM products.

Building on the high-performance XDR memory interface technology, the XDR2 memory interface is targeting applications that require extreme memory bandwidth, such as 3D graphics, advanced video imaging, and network routing and switching applications. In order to achieve high bandwidth efficiency and data rates of 8GHz and beyond the XDR2 memory interface incorporates:

-- Micro-threading -- a DRAM core innovation developed to increase memory system efficiency to enable DRAMs to provide more usable data bandwidth to requesting memory controllers, while minimizing power consumption;

-- Adaptive Timing -- a speed enhancement to today's XDR FlexPhase(TM) timing circuits that compensates for process, voltage and temperature variations during real-time operation;

-- Transmit Equalization -- an output circuit that minimizes the adverse system effects of reflections and attenuation that typically limit the speed of DRAM systems;

-- DRSL Signaling -- a 200mV differential signaling standard that provides superior common mode noise rejection with an on-chip terminated point-to-point topology that minimizes reflections and reduced signal transition times associated with device loading and PCB trace stubs.

"We are continually pushing interface technology forward to develop compelling and innovative solutions that meet our customers' needs," said Laura Stark, vice president of the Platform Solutions Group at Rambus. "XDR2 is our latest iteration of the XDR DRAM architecture and will help 3D games and graphics-intensive applications realize the high performance potential that users demand."

Rambus engineers work closely with chip and system companies to optimize the DRAM controllers to take advantage of the performance benefits that the XDR2 solution provides. The XDR2 memory interface is available for licensing now and could be shipping in products by 2007. Technical specifications are available from Rambus upon request. For additional information, please visit www.rambus.com/xdr.

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, Calif., with regional offices in Chapel Hill, North Carolina; Bangalore, India; Taipei, Taiwan; and Tokyo, Japan. Additional information is available at www.rambus.com.

Rambus and the Rambus logo are registered trademarks of Rambus Inc. XDR and FlexPhase are trademarks of Rambus Inc. All other trade names are the service marks, trademarks, or registered trademarks of their respective owners.



Contact:
Rambus Public Relations
Gabriele Collier, 650-947-5522

Email Contact
    or
Citigate Cunningham
Lisa Kennedy, 415-618-8726

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