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Four green DDR5 RDIMM modules with gold contacts, no heat spreaders

OWC

OWC 128GB (4x32GB) DDR5 4800 CL40 ECC RDIMM ThinkSystem SR950 V3

SKU CH-4E7A-DRD5Y

128 GB DDR5 ECC registered kit (four 32 GB modules) at 4800 MT/s CL40 for Lenovo ThinkSystem SR950 V3 servers

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank1Rx4

Capacity 128GB (4 x 32GB)

  • 128 GB total capacity with four 32 GB modules
  • DDR5 4800 speed rated at PC5-38400 for server workloads
  • CL40 latency at 1.1 V for efficient operation
  • ECC registered design protects data integrity in ThinkSystem SR950 V3
  • JEDEC and RoHS compliant for warranty-safe upgrades

Server memory kit

This OWC kit provides 128GB of DDR5 ECC registered memory in four 32GB modules. It is built for the Lenovo ThinkSystem SR950 V3 server platform. The modules run at 4800 MT/s with CL40 latency at 1.1V.

Compatibility check

Verify that your SR950 V3 supports DDR5 4800 registered DIMMs and that the memory population rules allow four 1Rx4 modules. This memory cannot be mixed with unbuffered or load-reduced DIMMs. The system must accept 288-pin registered ECC modules.

Suitable for server upgrades

This kit suits administrators expanding capacity in a compatible ThinkSystem SR950 V3. It is not for desktop PCs or workstations that require unbuffered memory. Buyers needing load-reduced DIMMs or non-ECC modules should look at other memory types.

How it compares

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

Price $3,316.99
Pricier than about 74% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $25.91 per GB
Pricier than about 71% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D51R4128S
Total capacity128 GB (4 × 32 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
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

What does the 128GB kit include and is anything else required for installation?

The kit contains four 32GB DDR5 4800 CL40 1Rx4 288-pin 1.1V ECC Registered RDIMM modules. No additional parts are required for a compatible ThinkSystem SR950 V3 server.

How do I decide between the available capacities for this server?

This listing provides a single 128GB configuration as four 32GB modules. Select this kit when your SR950 V3 needs that total capacity in a matched set.

What does the DDR5 4800 CL40 rating mean for real-world server performance?

The modules run at 4800 MT/s with CAS latency 40 at 1.1V, delivering JEDEC-standard bandwidth and error-corrected stability for the SR950 V3 memory subsystem.

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