Rambus’ RCD Chip Enables DDR5-5600 for Next-Gen Servers

Rambus has introduced its 2nd generation registering clock driver (RCD) chip for DDR5 memory, a key component that will enable memory module makers to build registered DDR5 modules with an up to 5600 MT/s data transfer rate for next-generation servers.

Rambus already has its 1st generation RCD for DDR5-4800 RDIMMs that will power upcoming servers based on Intel’s 4th Generation Xeon Scalable ‘Sapphire Rapids’ and other DDR5-supporting CPUs. The company’s 2nd generation RCD will be used for RDIMM and LRDIMM modules aimed at next-generation machines that will support DDR5-5600 memory.

An RCD is a buffer that sits between memory controller and DRAM ICs and redistributes the command / address signals within the module to improve the signal integrity and connect more memory devices to one DRAM channel. Since RCD is a buffer, it naturally extends latencies. The RCD needs to support a very specific data transfer rate to work properly, so Rambus’ 2nd generation DDR5 RCD is indeed aimed at subsystems supporting a 5600 MT/s data transfer rate.

(Image credit: Rambus)

Rambus says that its 2nd Generation DDR5 RCD not only delivers a 17% higher peak bandwidth, but does so at optimized latencies to boost real-world RDIMM performance as well as at lower power. 

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