HPE 64GB 2Rx4 DDR4-3200 CAS-22 RDIMM Registered Memory Kit

The HPE P56431-B21 is a 64GB registered memory kit with two ranks of x4 chips, running at DDR4-3200 with a CAS latency of 22. It supports ECC.

Reaching 64GB with a standard registered design avoids the LRDIMM trade-offs, so a server can raise capacity per slot without changing module type. That suits virtualization hosts, databases and other memory-hungry roles on platforms that run RDIMMs.

The product title calls it a Registered Memory Kit, and no alternative part numbers are listed, so identify it by the P56431-B21 number when you compare quotes.

Population rules matter: servers often limit speed or module count when channels are heavily populated. Check the memory guide for your ProLiant model and keep every module the same type and speed.

The kit is offered in all three conditions. New and refurbished carry a choice of 1 year or 3 years of warranty, and used carries 90 days. An RFQ for P56431-B21 gets you a price within one business day.