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Two green DDR5 RDIMM modules with gold contacts and black chips

OWC

OWC 256GB (2x128GB) DDR5 4800 CL40 4Rx4 ECC Registered RDIMM memory upgrade HP Cray XD220v XD225v XD295v XD670

SKU CH-8YVH-AXNF0

A 256 GB DDR5 4800 ECC registered RDIMM kit (2 × 128 GB, CL40, 1.1 V, 4Rx4) for HP Cray XD220v, XD225v, XD295v and XD670 servers

  • Capacity256GB (2 x 128GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 256GB (2 x 128GB)

  • 256 GB total capacity from two 128 GB modules
  • DDR5 4800 speed rated at PC5-38400 CL40
  • ECC registered RDIMM for server error correction
  • 1 V operation reduces power draw
  • Validated for HP Cray XD220v, XD225v, XD295v, XD670

HP Cray server memory upgrade

This 256GB kit contains two 128GB DDR5 ECC registered RDIMMs built for HP Cray XD220v, XD225v, XD295v and XD670 servers. It targets administrators who need maximum registered capacity in those specific platforms. The modules will not work in standard desktops or systems requiring unbuffered or load-reduced memory.

JEDEC DDR5 4800 speed ceiling

The kit runs at DDR5 4800 (PC5-38400) with CL40 latency at 1.1V, matching the JEDEC baseline for this generation. Bandwidth and latency are fixed by that standard, so workloads needing higher frequencies or tighter timings cannot be satisfied by this part. Mixing with faster or slower DIMMs will force the system to the lowest common speed.

288-pin registered DIMM layout

Each module uses a 288-pin registered form factor without a heat spreader, relying on server chassis airflow for cooling. The registered buffer adds one clock cycle of latency but enables the 4Rx4 density required for 128GB per DIMM. Installers must populate slots according to the HP Cray memory population rules for the target model.

Highlights

  • 256 GB total capacity from two 128 GB modules
  • DDR5 4800 speed rated at PC5-38400 CL40
  • ECC registered RDIMM for server error correction
  • 1 V operation reduces power draw
  • Validated for HP Cray XD220v, XD225v, XD295v, XD670

Specifications

BrandOWC
Part Number4R8D54R4256P
Capacity256GB (2 x 128GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
Heat SpreaderNo
Compatible SystemHP Cray XD220v
HP Cray XD225v
HP Cray XD295v
HP Cray XD670

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Questions about this item

Should I pick the 256 GB kit or buy single 128 GB modules?

The kit ships as two matched 128 GB modules for 256 GB total; buying singles risks mixing ranks or batches and can prevent the server from booting.

What does the 4800 MT/s rating deliver inside an HP Cray XD220v?

The modules run at JEDEC-standard DDR5 4800 MT/s with CL40 latency, giving the maximum qualified throughput for those Cray platforms.

Is the 288-pin DDR5 RDIMM interface limited by the platform?

The 288-pin registered ECC RDIMM form factor is keyed for DDR5 only and operates at 1.1 V, so it fits and runs at the rated 4800 MT/s on the listed XD servers.

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