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Two green 288-pin DDR4 LRDIMM modules in anti-static tray

OWC

OWC 512GB (2×256GB) DDR4 2933 PC4-23400 CL21 8Rx4 288-pin 1.2V ECC Load Reduced LRDIMM memory upgrade

SKU CH-7M5W-Q93XV

512 GB DDR4 2933 MHz ECC load-reduced DIMM kit for Cisco UCS M5 servers, 288-pin CL21 1.2 V

Capacity 512GB (2 x 256GB)

  • 512 GB total capacity with two 256 GB modules
  • DDR4 2933 MHz CL21 rated for high-throughput server workloads
  • ECC load-reduced design maintains data integrity under heavy multi-tasking
  • Runs at 1.2 V for lower power draw in dense configurations
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Server-grade ECC LRDIMM kit

This OWC kit delivers 512 GB of DDR4 memory as two 256 GB load-reduced DIMMs. It is built for Cisco UCS B200 M5, B480 M5, C220 M5, C240 M5 and C480 M5 servers that require ECC load-reduced modules. The kit will not work in standard desktops and cannot be mixed with unbuffered or registered ECC memory.

288-pin 1.2 V LRDIMM form factor

Each module uses the 288-pin DDR4 LRDIMM layout and runs at 1.2 V, matching the power profile of the target Cisco platforms. The load-reduced design lowers electrical load on the memory controller, allowing the high 256 GB per DIMM density. CL21 latency and PC4-23400 2933 MHz speed are standard for this module class.

Replaces Cisco UCSML256G8RTH

This kit directly replaces the Cisco part number UCSML256G8RTH, doubling capacity per slot to 256 GB. It also runs at 2133, 2400 and 2666 MHz for backward compatibility with slower memory buses. The upgrade is worthwhile when the server needs maximum DIMM density for virtualization or large in-memory workloads.

Highlights

  • 512 GB total capacity with two 256 GB modules
  • DDR4 2933 MHz CL21 rated for high-throughput server workloads
  • ECC load-reduced design maintains data integrity under heavy multi-tasking
  • Runs at 1.2 V for lower power draw in dense configurations
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Specifications

No published specifications for this item yet.

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Questions about this item

Does the PC4-23400 2933MHz DDR4 interface cap at 2933MHz in a Cisco UCS server?

The kit runs at 2933MHz CL21 and is backward compatible with 2133MHz, 2400MHz and 2666MHz speeds.

What physical slot and module size do these 256GB LRDIMMs need?

Each module is a 288-pin ECC Load Reduced DIMM; two modules give 512GB total.

How are the two 256GB LRDIMMs installed, and what step is often missed?

Insert both modules into matching DDR4 slots for the Cisco UCS model; do not mix with unbuffered or registered ECC memory.

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