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RDRAM®

what is RDRAM® ?

Designed using Rambus Signaling Levels (RSL), RDRAM devices provide designers with operating speeds significantly faster than currently available DRAM devices.

RDRAM devices provide systems with 16MB to 2GB of memory capacity at speeds of up to 1066MHz. The RDRAM channel achieves its a high-speed through several innovative techniques that include separate control and address buses, highly efficient protocol, low voltage signaling and precise clocking to minimize skew between clock and data lines

why RDRAM® is the primary memory for Pentium4?
memory system architecture comparison RDRAM RDRAM provides best, most balanced solution for Pentium®4 systems
  • The front side bus and memory sub system are matched at 3.2GB/s for optimized performance.
  • Memory bandwidth is becoming more important as the Pentium 4 increases in speed.
what are the advantages of RDRAM®?

RDRAM memory is the best choice for PCs and Workstations

  • balance : 3.2GB/s 2-Channel RDRAM memory matches today's Pentium4 processor front side bus
  • performance : Twice the effective bandwidth of competing technologies in half the pins
  • value : System performance unencumbered by memory allows RDRAM systems with slower CPUs to outper-form faster systems on competing memory technologies
  • granularity & simplicity : Single device upgrades, cost-effective board and module solutions
minimum memory upgrade/footprint
memory yype SDRAM : 64b bus
RDRAM : 1channel
SDRAM : 128b bus
RDRAM : 2channel
256Mb gen 512Mb gen 256Mb gen 512Mb gen
SDRAM ×8 256MB 512MB 512MB 1GB
SDRAM ×16 126MB 256MB 256MB 512MB
RDRAM 32MB 64MB 64MB 128MB
where is RDRAM® in use ?

The explosive demands from the Internet and high-performance consumer products are driving the need for more bandwidth. RDRAM has helped to close the bandwidth gap with the best price/performance system solution for today and future system design requirements.

RDRAM is designed into today most advanced computer, consumer and communications products. Many of these products are Best-of-Class in their marketplace and the number of products is constantly growing.

computer products, desktop PCs, PC workstations and servers

System memory bandwidth is more important than ever before. The increase in processor performance, multimedia and 3D graphics, high bandwidth memory is essential to sustain system performance. RDRAM memory provides the bandwidth necessary to extract the full potential of the Intel Pentium™ 4 processor.

Today's workstations and servers require great performance, high bandwidth and reliability. Professional users choose systems with RDRAM memory for exceptional performance, bandwidth headroom and platform longevity.

consumer products

Consumer products demand the highest levels of performance to give life-like animation to game consoles, and high-quality digital imaging in digital HDTVs, and high-speed encoding/decoding in set-top boxes.

communications products

With the proliferation of the Internet and the demand for faster, more reliable systems, leading manufacturers have turned to RDRAM-based system solutions. RaSer?SerDes Cell technology offers communications companies a standard cell that easily integrates into their product. Using RDRAM memory helps customers to differentiate their systems from the competition while gaining the performance they needed.

highlight of RDRAM® performance
high bandwidth per pin Production worthy of 1066MHz short channel
PC : FSB frequency evolution every 3 years
N/W : Bandwidth evolution every 2 years
multiple transaction Internal 4 transaction simutaneously
number of bank Performance Gain due to High Row Hit Ratio
small pin count Chipset pin increment
Trend of integration
Package Size reduction of memory & controller
high bus efficiency Precise scalability of clock cycle(DLL inside)
Write buffer inside RDRAM
low EMI affect RSL Interface
Small amount of bus line