OWC 1TB (8x128GB) DDR5 4800 PC5-38400 CL40 4Rx4 288-pin 1.1V ECC Registered RDIMM memory upgrade

High-density DDR5 kit for HP Cray servers

This kit provides 1TB of DDR5 4800 memory across eight 128GB registered ECC RDIMMs. It targets the HP Cray XD220v, XD225v, XD295v and XD670 platforms that require registered modules. Standard desktop systems cannot use this memory type. Buyers needing unbuffered or load-reduced DIMMs should look elsewhere.

Installing registered ECC RDIMMs in supported Cray

Modules install into 288-pin DDR5 slots like any RDIMM, but the platform must support registered ECC at 1.1V. Mixing with unbuffered or load-reduced memory will prevent boot. Verify the server firmware revision matches the vendor qualified vendor list before installation. No heat spreader is fitted, so airflow across the DIMM rows must follow the chassis design.

Sustained throughput in multi-rank server workloads

Eight 4Rx4 modules at CL40 deliver consistent bandwidth under continuous ECC-corrected traffic typical of database and virtualization hosts. The JEDEC-standard PC5-38400 rating ensures timing stability during extended runs. Registered buffering reduces electrical load on the memory controller, helping maintain signal integrity at full population. Performance scales with the memory controller capabilities of the specific Cray model.