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Four green DDR5 RDIMM modules in anti-static tray

OWC

OWC 256GB (4x64GB) DDR5 4800 PC5-38400 CL40 2Rx4 288-pin 1.1V ECC Registered RDIMM Memory Upgrade Kit

SKU CH-DBG4-HEMHG

Adds 256 GB of DDR5-4800 ECC registered memory to Dell PowerEdge R660XS and R760XS servers

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 256GB (4 x 64GB)

  • 256 GB capacity across four 64 GB modules
  • DDR5 4800 speed rated at PC5-38400 CL40
  • ECC registered design detects and corrects data errors
  • 1 V operation reduces server power draw
  • Validated for Dell PowerEdge R660XS and R760XS

Server Memory Upgrade Kit

This OWC kit provides 256GB of DDR5 ECC Registered RDIMM memory across four 64GB modules. It is built for Dell PowerEdge R660XS and R760XS servers that require registered error-correcting memory. Standard desktop systems cannot use this memory type, and it must not be mixed with unbuffered or load-reduced modules.

Thermals and Power Draw

The modules operate at the JEDEC-standard 1.1V without heat spreaders, relying on the server's directed airflow for cooling. Registered buffering reduces electrical load on the memory controller, helping to keep power draw predictable under sustained workloads. Acoustic impact is determined by the platform's fan response to memory temperature.

Upgrade Context

This kit replaces smaller-capacity RDIMM sets or fills empty slots to reach the 256GB total. The jump is worthwhile when virtualisation density, in-memory databases or large dataset processing exceed the current memory ceiling. It is not for systems that accept only unbuffered or load-reduced DIMMs.

How it compares

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

Price $5,002.99
Pricier than about 80% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $19.54 per GB
Pricier than about 65% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D52R4256S
Total capacity256 GB (4 × 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 systemsDell PowerEdge R660XS
Dell PowerEdge R760XS

Other versions of this model

5 more in the same range

Questions about this item

How are the four 64GB DDR5 4800 RDIMMs installed in a Dell PowerEdge R660XS, and what step is often missed?

Power down the server, open the chassis, and seat each 288-pin module fully until the ejector clips click. The step often missed is verifying in the BIOS that all 256GB are recognised at 4800 MT/s with ECC active.

What maintenance or replacement will the OWC 4R8D52R4256S kit need later?

No routine maintenance is required. If a module fails, replace only the faulty 64GB RDIMM with another DDR5 4800 CL40 2Rx4 1.1V ECC registered DIMM to keep the matched set.

What limit appears first when the 256GB kit runs sustained workloads in a PowerEdge R760XS?

The memory controller’s maximum supported speed of 4800 MT/s is the first ceiling; the modules already operate at that JEDEC rate, so sustained throughput cannot exceed the 38400 MB/s PC5-38400 bandwidth.

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