OWC 256GB (2x128GB) DDR4 2933 CL21 4Rx4 288-pin 1.2V ECC LRDIMM memory upgrade

OWC 256GB DDR4 LRDIMM kit

This OWC kit supplies 256 GB of DDR4 memory as two 128 GB LRDIMM modules rated at 2933 MT/s with CL21 latency. The load-reduced ECC design targets HP Apollo 4200 Gen10 and 6500 Gen10 servers that require registered error-correcting memory. It will not work in standard desktop computers or in systems that accept only unbuffered or regular registered DIMMs.

Server memory upgrade considerations

Each module uses a 288-pin DDR4 form factor and operates at 1.2 V, matching the voltage of the supported Apollo platforms. Because the sticks are load-reduced, they must populate slots that the server firmware recognises as LRDIMM-capable and cannot be mixed with unbuffered or standard registered modules. The kit frees the builder from sourcing individual HP part numbers such as P19047-H21 or P11040-B21.

Capacity headroom for virtualization workloads

The 256 GB total capacity supports dense virtualization, large in-memory databases and high-thread-count compute tasks on the compatible Apollo systems. Backward compatibility with 2133, 2400 and 2666 MT/s buses allows deployment in older configurations, though maximum bandwidth is reached only at the native 2933 MT/s rate. Workloads that exceed 256 GB per node will require additional memory channels or higher-density modules not included in this kit.