OWC 512GB (8x64GB) DDR4 2933 PC4-23400 CL21 ECC RDIMM memory upgrade

Purpose-built workstation memory

This kit delivers 512GB of DDR4 ECC registered memory across eight 64GB modules, validated for the HP Workstation Z8 G4. It targets professionals running virtualisation, large datasets or memory-bound rendering workloads that exceed standard desktop capacity. The registered design and error-correcting code protect data integrity in always-on server and workstation environments. Builders upgrading consumer desktops or mixing with unbuffered or load-reduced DIMMs cannot use this product.

Sustained-load behaviour

Each module operates at 2933MHz with CL21 latency and 1.2V, maintaining JEDEC-spec timing during extended compute sessions. Backward compatibility with 2133MHz, 2400MHz and 2666MHz platforms allows the kit to clock down automatically when installed in older slots. The 2Rx4 organisation spreads accesses across two ranks per DIMM, helping the memory controller keep bandwidth steady under multi-threaded pressure. No heat spreader is fitted, so chassis airflow must handle the thermal load during continuous operation.

Build and connectivity

The 288-pin RDIMM form factor locks into the Z8 G4’s registered DIMM slots with the standard centre key, ensuring correct orientation every time. Eight modules populate the workstation’s full complement of channels, so no empty slots remain to collect dust or limit future expansion. OWC tests every stick in-house and backs the kit with a limited lifetime warranty plus free technical support. The package replaces a long list of HP part numbers, simplifying procurement for IT teams managing fleets of Z8 G4 units.