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Four green DDR4 LRDIMM modules in anti-static bags

OWC

OWC 256GB (4x64GB) DDR4 2400 CL17 4Rx4 288-pin ECC LRDIMM Cisco UCS C240 M4

SKU CH-1XJC-9Q852

Four 64 GB DDR4-2400 ECC LRDIMMs totalling 256 GB, CL17 at 1.2 V, built for Cisco UCS C240 M4 servers

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 256GB (4 x 64GB)

  • ECC load-reduced design protects data integrity in servers
  • 256 GB kit (four 64 GB modules) maximises capacity
  • DDR4 2400 CL17 at 1.2 V balances speed and efficiency
  • 288-pin 4Rx4 LRDIMM built for Cisco UCS C240 M4
  • Backward compatible with 2133 MHz systems for flexible deployment

Cisco UCS C240 M4 memory kit

This kit provides 256GB of DDR4 ECC load-reduced memory across four 64GB modules for the Cisco UCS C240 M4 server. It is intended for administrators upgrading or repairing that specific platform. The modules will not work in standard desktops or in systems that require unbuffered or registered ECC DIMMs.

Capacity and headroom

Each module is a 4Rx4 64GB LRDIMM running at DDR4 2400 with CL17 latency, delivering 256GB total capacity for large virtualisation or database workloads. The kit fills four slots, so further expansion requires free DIMM sockets on the motherboard. Backward compatibility with 2133MHz operation is supported.

Thermals and power

The modules operate at 1.2V and have no heat spreaders, relying on chassis airflow for cooling. Load-reduced buffering reduces electrical load on the memory controller, helping power efficiency in dense configurations. Noise and thermal behaviour depend entirely on the server's fan profile and workload intensity.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $1,675.99
Pricier than about 66% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $6.55 per GB
Cheaper than about 60% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2L4D44R4256S
Total capacity256 GB (4 × 64 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Memory
CAS latencyCL17
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsCisco UCS C240 M4

Other versions of this model

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Questions about this item

Will these 2400MHz LRDIMMs run with my existing 2133MHz modules in the Cisco UCS C240 M4?

Yes, the kit is backward compatible with 2133MHz speeds, but LRDIMMs cannot be mixed with unbuffered or standard registered ECC DIMMs.

How can I confirm the 4Rx4 CL17 timings are active after installation?

Check the BIOS memory configuration or OS hardware report; it should show 2400 MT/s, CL17 latency, 4Rx4 organisation and ECC load-reduced status.

Does the 256GB kit include only the four 64GB sticks or are any tools or cables supplied?

The package contains the four 64GB DDR4 2400 CL17 4Rx4 288-pin ECC LRDIMM modules; no tools, cables or additional hardware are included.

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