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Two green DDR5 ECC registered RDIMM modules with gold contacts

OWC

OWC 256GB (2x128GB) DDR5 4800 CL40 ECC Registered RDIMM memory upgrade

SKU CH-655J-G8BYX

256 GB kit of two 128 GB DDR5 4800 ECC registered RDIMMs for Lenovo ThinkSystem SD650 V3, SD650-I V3, SD665 V3, SD665-N V3 and SR630 V3 servers

  • Capacity256GB (2 x 128GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 256GB (2 x 128GB)

  • 256 GB total capacity from two 128 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • CL40 latency at 1.1 V operating voltage
  • ECC registered 4Rx4 design for server data integrity
  • Validated for ThinkSystem SD650 V3 SD650-I V3 SD665 V3 SD665-N V3 SR630 V3

Server-grade DDR5 upgrade kit

This 256 GB kit supplies two 128 GB DDR5 4800 CL40 registered ECC RDIMMs built for Lenovo ThinkSystem SD650 V3, SD650-I V3, SD665 V3, SD665-N V3 and SR630 V3 servers. It targets IT teams expanding memory capacity in compatible rack or dense-compute platforms.

288-pin registered ECC modules

Each stick uses a 4Rx4 organisation at 1.1 V with no heat spreader, fitting standard DDR5 RDIMM slots in the listed systems. The registered buffer and on-die ECC maintain data integrity under sustained workloads but prevent use in consumer desktops or alongside unbuffered or load-reduced DIMMs.

JEDEC-compliant matched pair

The two modules are tested together to meet JEDEC and RoHS standards, delivering a warranty-safe upgrade that preserves the server’s original firmware validation. No extra cables, brackets or software licences are included in the package.

Highlights

  • 256 GB total capacity from two 128 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • CL40 latency at 1.1 V operating voltage
  • ECC registered 4Rx4 design for server data integrity
  • Validated for ThinkSystem SD650 V3 SD650-I V3 SD665 V3 SD665-N V3 SR630 V3

Specifications

BrandOWC
Part Number4R8D54R4256P
Capacity256GB (2 x 128GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
Heat SpreaderNo
Compatible SystemLenovo ThinkSystem SD650 V3
Lenovo ThinkSystem SD650-I V3
Lenovo ThinkSystem SD665 V3
Lenovo ThinkSystem SD665-N V3
Lenovo ThinkSystem SR630 V3

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Questions about this item

What DDR5 speed does the PC5-38400 rating actually run at?

The kit runs at DDR5 4800, which is the JEDEC-standard speed for the PC5-38400 designation.

What physical slot and clearance does a 288-pin 4Rx4 RDIMM need?

It fits a standard 288-pin DDR5 DIMM slot; the modules have no heat spreader, so they fit in tight 1U server bays.

What is the correct order for populating the two 128 GB modules in a ThinkSystem SR630 V3?

Install one module per processor socket, using the first channel slot indicated in the server's memory population guide.

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