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Four green DDR5 RDIMM modules in static bags

OWC

OWC 128GB (4x32GB) DDR5 4800 CL40 ECC Registered RDIMM Cisco UCS M7 memory upgrade

SKU CH-5CFN-9B4MA

A 128 GB kit of four 32 GB DDR5 4800 CL40 ECC registered RDIMMs validated for Cisco UCS C220 M7 SFF, C240 M7 SFF, X210c M7 and X410c M7 servers

  • Capacity128GB (4 x 32GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 128GB (4 x 32GB)

  • 128 GB total capacity in a matched 4 × 32 GB kit
  • ECC registered RDIMM detects and corrects single-bit errors
  • DDR5 4800 PC5-38400 CL40 at 1.1 V
  • 288-pin 1Rx4 modules validated for Cisco UCS C220 M7 SFF, C240 M7 SFF, X210c M7, X410c M7
  • Replaces Cisco part UCSMRX32G1RE1 for direct upgrade compatibility

Target platforms

This kit provides 128GB of DDR5 ECC Registered RDIMM across four 32GB modules. It is built for Cisco UCS C220 M7 SFF, C240 M7 SFF, X210c M7 and X410c M7 servers that require registered memory with error correction. Standard desktop boards cannot use these modules.

Registered ECC difference

Registered buffering and ECC let the memory controller manage larger capacities while detecting and correcting single-bit errors. The modules cannot be mixed with unbuffered or load-reduced DIMMs, so the full kit must populate matched slots in the supported Cisco chassis.

DDR5 4800 practical limits

The JEDEC-standard DDR5 4800 interface runs at 1.1V with CL40 latency and a 288-pin form factor. Bandwidth and timing are fixed by the specification; actual throughput depends on the server memory controller and populated channel count.

Highlights

  • 128 GB total capacity in a matched 4 × 32 GB kit
  • ECC registered RDIMM detects and corrects single-bit errors
  • DDR5 4800 PC5-38400 CL40 at 1.1 V
  • 288-pin 1Rx4 modules validated for Cisco UCS C220 M7 SFF, C240 M7 SFF, X210c M7, X410c M7
  • Replaces Cisco part UCSMRX32G1RE1 for direct upgrade compatibility

Specifications

BrandOWC
Part Number4R8D51R4128S
Capacity128GB (4 x 32GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank1Rx4
Heat SpreaderNo
Compatible SystemCisco UCS C220 M7 SFF
Cisco UCS C240 M7 SFF
Cisco UCS X210c M7
Cisco UCS X410c M7

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Questions about this item

Will the four 32 GB DDR5 modules need any firmware updates or periodic replacement?

The modules are solid-state with no moving parts and no firmware to update; they are designed to remain in service for the life of the server.

What limit appears first when the kit runs at 4800 MT/s CL40 under continuous load?

The CAS latency of CL40 and the fixed 4800 MT/s data rate set the timing ceiling that the memory controller cannot exceed.

How much heat and power do the 1.1 V registered DIMMs produce during all-day operation?

Each 32 GB module operates at 1.1 V without a heat spreader, so power draw and thermal output stay at standard DDR5 registered DIMM levels.

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