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Four green 288-pin DDR4 LRDIMM modules with black chips, no heat spreaders

OWC

OWC 256GB (4x64GB) DDR4 2400 CL17 4Rx4 288-pin 1.2V ECC LRDIMM Kit

SKU CH-8CHQ-FYPKC

256 GB kit of four 64 GB DDR4 ECC load-reduced DIMMs at 2400 MT/s CL17 for Cisco UCS B420 M4 and C460 M4 servers

  • Capacity256GB (4 x 64GB)
  • Type288-Pin DDR4 ECC LRDIMM
  • SpeedDDR4 2400 (PC4 19200)
  • CAS LatencyCL17
  • Voltage1.2V
  • ECCYes

Capacity 256GB (4 x 64GB)

  • 256 GB kit with four 64 GB modules for high-density server memory
  • DDR4 2400 CL17 timing at 1.2 V for efficient data throughput
  • ECC load-reduced 4Rx4 design protects data integrity in critical workloads
  • 288-pin LRDIMM form factor fits Cisco UCS B420 M4 and C460 M4 platforms
  • Backward compatible with 2133 MHz systems for flexible deployment

Server memory upgrade

This OWC kit provides 256GB of DDR4 ECC LRDIMM memory across four 64GB modules. It is built for Cisco UCS B420 M4 and C460 M4 servers that require load-reduced registered DIMMs. The modules run at 2400MHz with CL17 latency and 1.2V operation.

Replacing lower-capacity LRDIMMs

The kit replaces smaller LRDIMM configurations when the workload demands more memory per channel. The jump is worth it when the server hits capacity limits on virtualisation, database or compute tasks that need the full 256GB. It is not for systems that accept only unbuffered or standard registered ECC DIMMs.

Installation and common issues

Installation follows the standard 288-pin DIMM procedure for the supported Cisco platforms. The most common issue is mixing these load-reduced modules with unbuffered or registered ECC memory, which the platform does not support. Verify the server BIOS recognises all four modules at the correct 2400MHz or 2133MHz speed after seating.

Highlights

  • 256 GB kit with four 64 GB modules for high-density server memory
  • DDR4 2400 CL17 timing at 1.2 V for efficient data throughput
  • ECC load-reduced 4Rx4 design protects data integrity in critical workloads
  • 288-pin LRDIMM form factor fits Cisco UCS B420 M4 and C460 M4 platforms
  • Backward compatible with 2133 MHz systems for flexible deployment

Specifications

BrandOWC
Part Number2L4D44R4256S
Capacity256GB (4 x 64GB)
Type288-Pin DDR4 ECC LRDIMM
SpeedDDR4 2400 (PC4 19200)
CAS LatencyCL17
Voltage1.2V
ECCYes
Buffered/RegisteredLoad Reduced
Rank4Rx4
Heat SpreaderNo
Compatible SystemCisco UCS B420 M4
Cisco UCS C460 M4 (DDR4)

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Questions about this item

Will these 288-pin DDR4 LRDIMMs fit the memory slots in a Cisco UCS B420 M4 or C460 M4 server?

Yes, the kit is built for those models; each 64 GB module uses the standard 288-pin DDR4 LRDIMM form factor required by the B420 M4 and C460 M4 (DDR4) platforms.

What is the correct order for installing the four 64 GB modules so the server recognises the full 256 GB?

Populate the slots in the sequence shown in the Cisco service guide for your chassis — typically filling each channel evenly before adding a second rank per channel — otherwise the system may report less memory or fail to boot.

When should the 1.2 V ECC load-reduced modules be replaced to keep the server running reliably?

Replace them if the system logs show rising correctable ECC error counts, if memory diagnostics report uncorrectable failures, or when a planned capacity upgrade requires higher-density modules.

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