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Two green DDR5 RDIMM modules with gold contacts and black chips

OWC

OWC 32GB (2x16GB) DDR5 4800 CL40 ECC Reg RDIMM ThinkSystem SR635/645/650/655/665 V3

SKU CH-ZMJ3-S2BV6

32 GB dual-channel DDR5 4800 CL40 ECC registered RDIMM kit for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers

  • Capacity32GB (2 x 16GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 32GB (2 x 16GB)

  • ECC registered design protects data integrity in servers
  • 32 GB kit (2 × 16 GB) expands memory capacity
  • DDR5 4800 CL40 at 1.1 V delivers rated speed
  • Validated for ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3, SR665 V3
  • JEDEC and RoHS compliant for warranty-safe upgrades

Purpose-built server upgrade

This 32 GB kit supplies two 16 GB DDR5 4800 CL40 registered ECC modules rated at 1.1 V. It is designed for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers that require 288-pin RDIMM memory with 1Rx8 organisation.

When registered ECC is mandatory

The kit replaces or adds to existing registered ECC RDIMM populations in the listed ThinkSystem platforms. It cannot be mixed with unbuffered or load-reduced modules, so the upgrade is only worthwhile when the system already uses or demands registered ECC memory.

Straightforward DIMM installation

Modules slot into the server's 288-pin DDR5 sockets without tools or heat-spreader clearance concerns. The usual risk is mixing registered ECC with incompatible memory types, which prevents the system from posting.

Highlights

  • ECC registered design protects data integrity in servers
  • 32 GB kit (2 × 16 GB) expands memory capacity
  • DDR5 4800 CL40 at 1.1 V delivers rated speed
  • Validated for ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3, SR665 V3
  • JEDEC and RoHS compliant for warranty-safe upgrades

Specifications

BrandOWC
Part Number4R8D51R8032P
Capacity32GB (2 x 16GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank1Rx8
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 kit uses the standard 288-pin DDR5 registered DIMM form factor that matches the SR650 V3 memory slots.

What is the correct installation sequence for the two 1Rx8 modules in a ThinkSystem SR635 V3?

Populate the slots designated for channel A first, then channel B, following the server's documented memory population order for 1Rx8 registered DIMMs.

When should the 1.1 V ECC registered modules be replaced in a ThinkSystem SR665 V3?

Replace them if the system logs correctable ECC errors that exceed the platform threshold or if a module fails the built-in memory diagnostics.

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