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Four green DDR5 ECC RDIMM modules, 288-pin, no heat spreaders

OWC

OWC 128GB (4x32GB) DDR5 4800 CL40 ECC RDIMM 2Rx8 1.1V memory upgrade

SKU CH-6DRS-0VY3A

A 128 GB DDR5 4800 CL40 ECC registered RDIMM kit of four 32 GB modules at 1.1 V for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers

  • Capacity128GB (4 x 32GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 128GB (4 x 32GB)

  • 128 GB total capacity from four 32 GB modules
  • DDR5 4800 speed with CL40 latency for responsive server workloads
  • ECC registered design detects and corrects data errors
  • Low 1.1 V operation reduces power draw and heat
  • Validated for Lenovo ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3

Server-grade DDR5 ECC RDIMM kit

This 128GB kit contains four 32GB DDR5 4800 CL40 registered DIMMs built for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers. The modules operate at 1.1V and include on-die ECC for data integrity in mission-critical workloads.

Registered 288-pin form factor

Each module uses a 288-pin RDIMM design with a 2Rx8 organisation, requiring a registered memory controller and preventing use in standard desktop platforms. The lack of heat spreaders keeps the profile low for dense server chassis while the JEDEC-standard pin-out ensures correct seating in qualified ThinkSystem slots.

DDR5 4800 bandwidth ceiling

The PC5-38400 rating sets a maximum transfer rate of 4800 MT/s per module, limiting total throughput to the memory controller's native speed. Mixing with unbuffered or load-reduced DIMMs is not supported, and capacity expansion beyond the kit depends on the server's maximum DIMM count and qualified memory population rules.

Highlights

  • 128 GB total capacity from four 32 GB modules
  • DDR5 4800 speed with CL40 latency for responsive server workloads
  • ECC registered design detects and corrects data errors
  • Low 1.1 V operation reduces power draw and heat
  • Validated for Lenovo ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3

Specifications

BrandOWC
Part Number4R8D52R8128S
Capacity128GB (4 x 32GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx8
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

Does the DDR5 4800 PC5-38400 speed run at its rated frequency in ThinkSystem SR635 V3 servers?

Yes, the modules are JEDEC-standard DDR5 4800 PC5-38400 CL40 and will operate at 4800 MT/s in the listed ThinkSystem models.

Will the 288-pin 2Rx8 registered DIMMs fit the memory slots in a ThinkSystem SR650 V3?

The kit uses standard 288-pin ECC registered RDIMMs with 2Rx8 organisation, matching the slot and rank requirements for the SR650 V3.

How are the four 32 GB modules installed, and what is the common mistake?

Populate all four DIMMs in the correct channel order per the server manual; the frequent error is mixing these registered modules with unbuffered or load-reduced memory.

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