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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

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank4Rx4

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.

How it compares

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

Price $7,714.99
Pricier than about 84% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $30.14 per GB
Pricier than about 86% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D54R4256P
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo ThinkSystem SD650 V3
Lenovo ThinkSystem SD650-I V3
Lenovo ThinkSystem SD665 V3
Lenovo ThinkSystem SD665-N V3
Lenovo ThinkSystem SR630 V3

Other versions of this model

5 more in the same range

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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