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Two green 288-pin DDR5 RDIMM modules, no heat spreader

OWC

OWC 128GB (2x64GB) DDR5 4800 CL40 2Rx4 ECC Registered RDIMM for ThinkSystem SR950 V3 memory upgrade

SKU CH-KFE6-E1XM2

Dual 64 GB DDR5-4800 CL40 ECC registered RDIMMs add 128 GB to a Lenovo ThinkSystem SR950 V3 server

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 128GB (2 x 64GB)

  • 128 GB total capacity from two 64 GB modules
  • DDR5 4800 speed with CL40 latency for server workloads
  • ECC registered design detects and corrects data errors
  • 1 V operation reduces power draw in dense configurations
  • Validated for Lenovo ThinkSystem SR950 V3 compatibility

Server ECC RDIMM Kit

This OWC kit provides 128 GB of DDR5 memory in two 64 GB registered DIMMs. It is built for the Lenovo ThinkSystem SR950 V3 and will not work in standard desktop computers.

Build Integration

Each module uses a 288-pin DDR5 interface at 1.1 V with CL40 timing and a 2Rx4 organisation. The registered design requires a platform that supports ECC registered memory and cannot be mixed with unbuffered or load-reduced modules.

Target Buyer

Suitable for administrators expanding a ThinkSystem SR950 V3 or deploying new server builds that demand ECC registered DDR5. Not for desktop users, workstations needing unbuffered DIMMs, or systems limited to lower-density modules.

How it compares

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

Price $2,957.99
Pricier than about 73% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (2 × 64 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $23.11 per GB
Pricier than about 68% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D52R4128P
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo ThinkSystem SR950 V3

Other versions of this model

5 more in the same range

Questions about this item

How many 64 GB modules are included in the 128 GB kit?

The kit contains two 64 GB DDR5 4800 CL40 registered ECC RDIMMs, giving 128 GB total capacity.

What is the operating voltage of these DDR5 4800 modules?

They run at 1.1 V, the standard JEDEC voltage for DDR5 4800 registered ECC memory.

Does the ThinkSystem SR950 V3 require registered ECC RDIMMs for this upgrade?

Yes, the SR950 V3 uses 288-pin DDR5 registered ECC RDIMMs; unbuffered or load-reduced modules are not compatible.

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