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Four green DDR5 RDIMM sticks with gold contacts and black chips

OWC

OWC 256GB (4×64GB) DDR5 4800 CL40 ECC Registered RDIMM Memory Upgrade Kit

SKU CH-TGMY-QX3VC

256 GB kit of four 64 GB DDR5 4800 CL40 ECC registered RDIMMs for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers

  • Capacity256GB (4 x 64GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 256GB (4 x 64GB)

  • ECC registered design protects data integrity in critical workloads
  • 256GB kit with four 64GB modules scales server memory capacity
  • DDR5 4800 CL40 at 1.1V delivers JEDEC-standard performance
  • 2Rx4 288-pin RDIMM form factor fits ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3
  • 100% JEDEC and RoHS compliant for warranty-safe upgrades

Server-Specific DDR5 ECC RDIMM Kit

This 256GB kit contains four 64GB DDR5 4800 CL40 registered ECC modules built for Lenovo ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 and SR665 V3 servers. It runs at 1.1V using 2Rx4 288-pin RDIMMs without heat spreaders. The memory is JEDEC-standard and RoHS compliant for warranty-safe upgrades.

Who This Suits And Who It Does Not

IT teams upgrading or repairing the listed ThinkSystem platforms gain a validated 256GB configuration in a single package. Buyers who need unbuffered memory for desktop boards or workstations that require load-reduced DIMMs cannot use this kit. Mixing with non-registered or LRDIMM modules is not supported.

Registered ECC Is The Deciding Factor

The modules are registered ECC RDIMMs, so they only work in systems designed for that exact memory type. Standard consumer motherboards and many workstation boards will not post with registered DIMMs installed. Verify your platform requires registered ECC before ordering.

Highlights

  • ECC registered design protects data integrity in critical workloads
  • 256GB kit with four 64GB modules scales server memory capacity
  • DDR5 4800 CL40 at 1.1V delivers JEDEC-standard performance
  • 2Rx4 288-pin RDIMM form factor fits ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3
  • 100% JEDEC and RoHS compliant for warranty-safe upgrades

Specifications

BrandOWC
Part Number4R8D52R4256S
Capacity256GB (4 x 64GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemLenovo ThinkSystem SR635 V3
Lenovo ThinkSystem SR645 V3
Lenovo ThinkSystem SR650 V3
Lenovo ThinkSystem SR655 V3
Lenovo ThinkSystem SR665 V3

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Questions about this item

Will the 288-pin DDR5 RDIMMs fit the memory slots in a ThinkSystem SR650 V3?

Yes, the 288-pin DDR5 RDIMM form factor matches the slots used in the ThinkSystem SR650 V3 and the other listed V3 models.

What is the correct installation sequence for the four 64 GB modules to avoid a configuration error?

Populate the DIMM slots following the server's documented channel order, installing one module per channel before adding a second rank to any channel.

When should the 256 GB kit be replaced if ECC starts logging corrected errors?

Replace the kit when the system management log shows a rising trend of corrected errors that approaches the platform's threshold for predictive failure alerts.

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