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OWC

OWC 256GB (8x32GB) DDR4 2933 CL21 2Rx4 288-pin 1.2V ECC Registered RDIMM memory upgrade

SKU CH-PHZX-DVEEJ

Eight 32 GB DDR4 ECC registered RDIMMs running at 2933 MHz CL21 for Cisco UCS B200 M5, B480 M5, C220 M5, C240 M5 and C480 M5 servers

  • Capacity256GB (8 x 32GB)
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 256GB (8 x 32GB)

Show 2 more configurations
  • 256 GB total capacity from eight 32 GB modules
  • DDR4 2933 speed with CL21 latency at 1.2 V
  • ECC registered design detects and corrects data errors
  • 2Rx4 dual-rank organisation for higher density per slot
  • Compatible with Cisco UCS B200 M5 B480 M5 C220 M5 C240 M5 C480 M5

256 GB DDR4 2933 ECC Registered Kit

This kit supplies 256 GB across eight 32 GB DDR4 2933 CL21 registered DIMMs for Cisco UCS B200 M5, B480 M5, C220 M5, C240 M5 and C480 M5 servers. It targets administrators who need validated ECC registered memory to expand capacity or replace Cisco part numbers HXMRX32G2RTH, HXSPM32G2RTH and UCSMRX32G2RTH. The modules run at 1.2 V and carry JEDEC PC4-23400 ratings.

Installation and common issues

Each 288-pin DIMM seats in the server’s registered DIMM slots; the key notch aligns with the slot to prevent misinsertion. Mixing these registered modules with unbuffered or load-reduced ECC DIMMs will prevent the system from posting. Populate all eight slots identically to keep memory channels balanced and avoid training failures.

Pre-order checks

Confirm the target chassis is one of the listed Cisco UCS M5 models and that the BIOS revision supports 2933 MT/s registered DIMMs. Verify the existing memory population allows eight identical 2Rx4 modules without exceeding the platform’s maximum rank-per-channel limit. Ensure the operating voltage is set to 1.2 V; the kit is backward compatible with 2133, 2400 and 2666 MT/s speeds if the platform requires a lower rate.

Highlights

  • 256 GB total capacity from eight 32 GB modules
  • DDR4 2933 speed with CL21 latency at 1.2 V
  • ECC registered design detects and corrects data errors
  • 2Rx4 dual-rank organisation for higher density per slot
  • Compatible with Cisco UCS B200 M5 B480 M5 C220 M5 C240 M5 C480 M5

Specifications

BrandOWC
Part Number2R9D42R4256K
Capacity256GB (8 x 32GB)
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

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Questions about this item

How can I verify the 2933 MHz speed and CL21 latency are active after installing the 8 modules in my Cisco UCS C240 M5?

Enter the server BIOS or use a tool such as dmidecode to confirm each 32 GB DIMM reports DDR4 2933 PC4-23400 CL21 2Rx4 at 1.2 V and that the total capacity shows 256 GB with ECC registered mode enabled.

What does the kit contain and do I need any extra parts for a Cisco UCS B200 M5?

The box includes eight 32 GB 288-pin DDR4 ECC registered RDIMMs (part number 2R9D42R4256K); no additional brackets, cables or cooling are required for the listed Cisco UCS servers.

Which capacity should I choose if my Cisco UCS C480 M5 has 24 DIMM slots and I want to maximise memory per slot?

This 256 GB kit (8 × 32 GB) fills eight slots with the highest density modules offered in the compatibility list, leaving the remaining slots available for future expansion.

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