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Two green DDR5 ECC registered DIMMs with gold contacts

OWC

OWC 4R8D54R4256P 256GB (2x128GB) DDR5 4800 CL40 4Rx4 ECC RDIMM

SKU CH-GFQV-1FBE5

256 GB kit of two 128 GB DDR5 4800 CL40 ECC registered RDIMMs for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 256GB (2 x 128GB)

  • ECC registered design protects data integrity in critical workloads
  • 256 GB total capacity across two 128 GB modules
  • DDR5 4800 speed with CL40 latency for responsive server performance
  • 1 V operation reduces power draw in dense configurations
  • Validated for Lenovo ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3

Server memory upgrade kit

This OWC kit supplies 256 GB of DDR5 ECC registered memory as two 128 GB modules. It is built for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers. The modules will not work in standard desktop computers or in systems that require unbuffered or load-reduced DIMMs.

Registered ECC with 4Rx4 organisation

Each module runs at DDR5 4800 (PC5-38400) with CL40 latency at 1.1 V. The 288-pin RDIMM form factor and 4Rx4 rank structure are fixed by the server platform, so this kit only fits the listed ThinkSystem models. Mixing with unbuffered or LRDIMM memory is not supported.

JEDEC and RoHS compliant

Compliance means the modules meet the industry standard for DDR5 registered DIMMs and contain no restricted substances. This protects the server warranty and allows the memory to be installed as a direct replacement without additional qualification steps.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $7,424.99
Pricier than about 83% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $29.00 per GB
Pricier than about 82% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D54R4256P
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo ThinkSystem SR635 V3
Lenovo ThinkSystem SR645 V3
Lenovo ThinkSystem SR650 V3
Lenovo ThinkSystem SR655 V3
Lenovo ThinkSystem SR665 V3

Other versions of this model

5 more in the same range

Questions about this item

What does the 4800 MT/s speed deliver in a ThinkSystem SR655 V3?

The modules run at DDR5 4800 with CL40 latency, providing the rated data rate when installed in supported ThinkSystem servers.

How does the PC5-38400 designation relate to the installed modules?

PC5-38400 is the JEDEC standard name for DDR5 4800 memory; these 288-pin RDIMMs conform to that specification.

What physical slot and clearance do the 128 GB RDIMMs need?

Each module is a 288-pin DDR5 RDIMM without a heat spreader, designed for the standard DIMM slots in ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers.

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