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Eight green DDR5 RDIMM modules in anti-static tray

OWC

OWC 1TB (8x128GB) DDR5 4800 CL40 4Rx4 ECC Registered RDIMM memory upgrade

SKU CH-KMGJ-GMKGT

Eight 128 GB DDR5 4800 CL40 ECC registered RDIMMs add 1 TB to HP ProLiant DL320 Gen11, DL380a Gen11 and DX320 Gen11 servers

  • Capacity1TB (8 x 128GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 1TB (8 x 128GB)

  • 1 TB capacity with eight 128 GB DDR5 modules
  • DDR5 4800 CL40 speed for high-throughput workloads
  • ECC registered 4Rx4 design protects data integrity
  • 1 V operation reduces power draw per module
  • Validated for HP ProLiant DL320 Gen11, DL380a Gen11, DX320 Gen11

Server-grade DDR5 capacity

This 1 TB kit delivers eight 128 GB registered ECC DDR5 modules running at 4800 MT/s with CL40 latency. It targets administrators upgrading HP ProLiant DL320 Gen11, DL380a Gen11 or DX320 Gen11 platforms that require registered memory. The kit is not suited for standard desktop boards or systems that accept only unbuffered or load-reduced DIMMs.

Registered DDR5 interface limits

Registered DDR5 adds a clock cycle for the register, so latency is higher than unbuffered equivalents at the same data rate. The 4800 MT/s JEDEC speed is the baseline for this generation; overclocking headroom is minimal on server platforms that lock memory timing. Mixing these 4Rx4 modules with any other rank configuration or memory type will prevent the system from posting.

Build and connector implications

Each module uses a 288-pin DDR5 edge connector and operates at 1.1 V without a heat spreader, relying on chassis airflow for cooling. The eight-stick population fills every slot on compatible two-socket boards, leaving no room for future expansion unless higher-density parts become qualified. Handling requires ESD precautions because the exposed DRAM packages are sensitive to static discharge.

Highlights

  • 1 TB capacity with eight 128 GB DDR5 modules
  • DDR5 4800 CL40 speed for high-throughput workloads
  • ECC registered 4Rx4 design protects data integrity
  • 1 V operation reduces power draw per module
  • Validated for HP ProLiant DL320 Gen11, DL380a Gen11, DX320 Gen11

Specifications

BrandOWC
Part Number4R8D54R41TBK
Capacity1TB (8 x 128GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
Heat SpreaderNo
Compatible SystemHP ProLiant DL320 Gen11
HP ProLiant DL380a Gen11
HP ProLiant DX320 Gen11

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Questions about this item

How do I know this 1TB kit with eight 128GB modules fits my server?

The kit is validated for HP ProLiant DL320 Gen11, DL380a Gen11 and DX320 Gen11 and uses 288-pin DDR5 ECC Registered RDIMMs at 1.1V, matching the platforms' memory specifications.

What does the 4800MHz CL40 rating mean for actual throughput?

The modules run at the JEDEC DDR5 4800 (PC5-38400) standard with CAS latency 40, delivering the rated bandwidth and latency when installed in the supported ProLiant Gen11 servers.

Does the 4Rx4 registered ECC design limit how many DIMMs I can populate?

Each module is a 4Rx4 registered ECC DIMM; the maximum supported capacity and population rules are defined by the specific ProLiant Gen11 model's memory architecture.

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