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Two green DDR4 ECC registered DIMMs, 288-pin, no heat spreaders

OWC

OWC 128GB (2x64GB) DDR4 2933 ECC RDIMM Cisco UCS M5 memory upgrade

SKU CH-28M4-BPQP9

ECC registered DDR4-2933 kit adds 128 GB across two 64 GB modules for Cisco UCS M5 servers

  • Capacity128GB (2 x 64GB)
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 128GB (2 x 64GB)

Show 2 more configurations
  • 128GB total capacity with two 64GB modules
  • DDR4 2933 speed rated PC4-23400 CL21
  • ECC registered for server data integrity
  • 2V operation matches Cisco UCS M5 specs
  • Backward compatible with 2133, 2400, 2666MHz systems

128GB DDR4 2933 ECC RDIMM kit

This 128GB kit contains two 64GB DDR4 2933 ECC registered DIMMs built for Cisco UCS M5 servers. The modules run at PC4-23400 CL21 with 1.2V voltage and a 2Rx4 organisation. They are designed for workloads that require error correction and registered signalling in supported Cisco platforms.

Suited for Cisco UCS M5 server upgrades

The memory fits Cisco UCS B200 M5, B480 M5, C220 M5, C240 M5 and C480 M5 systems. It will not work in standard desktop computers or consumer motherboards. It also cannot be mixed with unbuffered or load-reduced ECC modules, so buyers needing those configurations should look elsewhere.

Verify server model and memory population rules

Confirm the exact Cisco UCS M5 model matches the supported list before ordering. Check the server documentation for maximum capacity per slot, channel population order and whether 64GB registered DIMMs are supported in your configuration. Ensure the system firmware is current for full compatibility.

Highlights

  • 128GB total capacity with two 64GB modules
  • DDR4 2933 speed rated PC4-23400 CL21
  • ECC registered for server data integrity
  • 2V operation matches Cisco UCS M5 specs
  • Backward compatible with 2133, 2400, 2666MHz systems

Specifications

BrandOWC
Part Number2R9D42R4128P
Capacity128GB (2 x 64GB)
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemCisco UCS B200 M5
Cisco UCS B480 M5
Cisco UCS C220 M5
Cisco UCS C240 M5
Cisco UCS C480 M5

Other versions of this model

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Questions about this item

Does this kit require a Cisco UCS M5 server that supports DDR4 288-pin ECC Registered RDIMMs?

Yes. The modules are 288-pin DDR4 ECC Registered RDIMMs rated at 2933 MT/s and 1.2 V, designed for Cisco UCS B200 M5, B480 M5, C220 M5, C240 M5 and C480 M5 systems.

Can I add these 64 GB RDIMMs alongside existing 2133, 2400 or 2666 MHz DDR4 ECC Registered modules in the same server?

The kit is backward compatible with 2133, 2400 and 2666 MHz DDR4 ECC Registered DIMMs, but all modules will run at the speed of the slowest installed DIMM and must share the same registered ECC type.

How can I verify the kit is operating at the rated 2933 MT/s CL21 after installation?

Check the system BIOS or UEFI memory information screen; it should report each DIMM as 64 GB, 2Rx4, DDR4-2933 (PC4-23400) with CAS latency 21 and 1.2 V operation.

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