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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

  • Total capacity32 GB (2 × 16 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank1Rx8

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.

How it compares

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

Price $857.99
Pricier than about 59% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB (2 × 16 GB)
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $26.81 per GB
Pricier than about 74% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D51R8032P
Total capacity32 GB (2 × 16 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank1Rx8
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

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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