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Four green DDR5 RDIMM modules with black chips no heat spreaders

OWC

OWC 128GB (4x32GB) DDR5 4800 CL40 ECC Registered RDIMM for Dell PowerEdge R660XS R760XS

SKU CH-CZ7J-PKFT1

128 GB DDR5 ECC registered RDIMM kit at 4800 MT/s CL40 for Dell PowerEdge R660XS and R760XS servers

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx8

Capacity 128GB (4 x 32GB)

  • 128 GB total capacity from four 32 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 Dell PowerEdge R660XS and R760XS systems

Server memory upgrade kit

This 128GB kit contains four 32GB DDR5 4800 CL40 ECC Registered RDIMMs built for Dell PowerEdge R660XS and R760XS servers. It targets administrators who need to expand memory capacity in these specific platforms.

Straightforward DIMM installation

Modules seat in the standard 288-pin DDR5 slots on the server motherboard. The registered design requires all populated slots to use registered ECC DIMMs; mixing with unbuffered or load-reduced memory will prevent the system from booting.

Registered ECC with 2Rx8 organisation

The 2Rx8 rank configuration and registered buffer are the decisive compatibility factors for the PowerEdge R660XS and R760XS memory controllers. Systems that require unbuffered or load-reduced modules cannot use this kit.

How it compares

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

Price $3,072.99
Pricier than about 73% 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 $24.01 per GB
Pricier than about 69% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D52R8128S
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 rank2Rx8
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsDell PowerEdge R660XS
Dell PowerEdge R760XS

Other versions of this model

5 more in the same range

Questions about this item

How do I verify the 4800 CL40 DDR5 ECC Registered modules are running correctly after installing them in my PowerEdge R660XS?

Check the BIOS memory configuration screen or run a server diagnostic; it should report four 32 GB DDR5 4800 CL40 2Rx8 registered ECC DIMMs at 1.1 V.

What exactly ships in the 128 GB kit and do I need anything else for the R760XS?

The kit contains four 32 GB DDR5 4800 PC5-38400 CL40 2Rx8 288-pin 1.1 V ECC Registered RDIMMs; no additional parts are required for the listed PowerEdge models.

Why choose the 4 x 32 GB 4800 CL40 ECC Registered RDIMM kit instead of a different capacity or speed?

This kit delivers 128 GB total across four slots at the JEDEC-standard 4800 MT/s CL40 timing required by the R660XS and R760XS, using 2Rx8 registered ECC modules at 1.1 V.

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