OWC 128GB (2x64GB) DDR4 2933 CL21 ECC RDIMM memory upgrade

128GB DDR4 2933 ECC RDIMM kit

This 128GB kit contains two 64GB DDR4 2933 CL21 ECC registered DIMMs built for Cisco HX220c M5, HX240c M5, HXAF220c M5, HX-E-220M5SX and C480 ML M5 servers. It runs at 1.2V with a 2Rx4 layout and replaces Cisco part numbers HXMRX64G2RTH, HXSPM64G2RTH, UCSMRX64G2RTH and UCSMRX64G2RTHS. Buyers who need unbuffered desktop memory cannot use this product.

Replaces slower DDR4 or fills empty slots

The modules are backward compatible with 2133, 2400 and 2666MHz DDR4 systems, so they can replace slower memory or populate vacant slots in the supported Cisco platforms. The jump is worth it when the server workload demands ECC registered capacity beyond the current configuration. Systems requiring load-reduced DIMMs or non-ECC memory will not accept this kit.

Check Cisco model and DIMM population rules

Verify the exact Cisco model matches the supported list before ordering. Confirm the server accepts 2Rx4 registered DIMMs at the target speed and that the memory-channel population rules allow two 64GB modules in the desired configuration. Mixing with unbuffered or load-reduced memory is not supported.