OWC 4R8D54R4128G 128GB DDR5 4800 CL40 4Rx4 288-pin 1.1V ECC Registered RDIMM memory upgrade

Server-grade DDR5 ECC RDIMM

This 128GB DDR5 4800 CL40 registered module is built for Gigabyte G293-Z21, G293-Z22, G293-Z23, G293-Z40 and G293-Z41 servers. It delivers ECC error correction and registered buffering for stable operation in multi-socket workstations, NAS systems and network switches. The single DIMM format simplifies capacity scaling in dense configurations.

JEDEC DDR5 4800 interface limits

The module runs at the baseline DDR5 4800 MT/s speed with CL40 latency at 1.1V, adhering to the PC5-38400 JEDEC standard. Registered signalling adds one cycle of command delay, which is mandatory for signal integrity at high density but prevents mixing with unbuffered or load-reduced DIMMs. The 4Rx4 organisation increases electrical load per channel, so population rules depend on the platform memory controller.

Replaces lower-capacity registered DDR5

It upgrades from smaller registered DDR5 DIMMs when workloads demand more memory per slot, such as virtualisation hosts or in-memory databases. The jump is worth it when the server board supports 128GB single-rank-equivalent density and the memory controller can address 4Rx4 modules at full speed. It does not fit standard desktop boards or systems requiring unbuffered or load-reduced memory.