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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

  • Capacity256GB (4 x 64GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

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.

Highlights

  • 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

Specifications

BrandOWC
Part Number4R8D52R4256S
Capacity256GB (4 x 64GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemDell PowerEdge R660XS
Dell PowerEdge R760XS

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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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