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Two green circuit boards with gold contacts and black memory chips

OWC

OWC 64GB (2x32GB) DDR4 2400 CL17 ECC Registered RDIMM Cisco UCS B420 M4 C460 M4

SKU CH-4QJ7-XGMK1

64GB dual-channel ECC registered DDR4-2400 kit for Cisco UCS B420 M4 and C460 M4 servers

  • Capacity64GB (2 x 32GB)
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2400 (PC4 19200)
  • CAS LatencyCL17
  • Voltage1.2V
  • ECCYes

Capacity 64GB (2 x 32GB)

  • ECC registered design protects data integrity in servers
  • 64 GB kit (2 × 32 GB) expands Cisco UCS B420 M4 and C460 M4 memory
  • DDR4 2400 CL17 at 1.2 V delivers rated bandwidth
  • 288-pin RDIMM form factor fits qualified Cisco UCS slots
  • Replaces Cisco part numbers HXMR1X322RVA, HXSPM32RVA, UCSMR1X322RVA, UCSMR1X322RVARF, UCSMR1X322RVAS

OWC 64GB DDR4 ECC RDIMM Kit

This OWC kit provides 64GB of DDR4 2400 memory using two 32GB registered DIMMs. It is built for Cisco UCS B420 M4 and C460 M4 servers that require ECC registered modules. The memory operates at 1.2V with CL17 latency and a 2Rx4 rank configuration. It will not work in standard desktop computers or alongside unbuffered or load-reduced DIMMs.

Thermals Noise Power

These modules have no heat spreaders and rely on server chassis airflow for cooling. Registered ECC DDR4 at 1.2V draws modest power per DIMM under typical server workloads. Acoustic output is determined by the host system fans rather than the memory itself.

Cisco Part Replacement Compatibility

The kit replaces Cisco part numbers HXMR1X322RVA, HXSPM32RVA, UCSMR1X322RVA, UCSMR1X322RVARF and UCSMR1X322RVAS. Using matched OWC modules simplifies qualification and avoids mixing registered with unbuffered or load-reduced memory.

Highlights

  • ECC registered design protects data integrity in servers
  • 64 GB kit (2 × 32 GB) expands Cisco UCS B420 M4 and C460 M4 memory
  • DDR4 2400 CL17 at 1.2 V delivers rated bandwidth
  • 288-pin RDIMM form factor fits qualified Cisco UCS slots
  • Replaces Cisco part numbers HXMR1X322RVA, HXSPM32RVA, UCSMR1X322RVA, UCSMR1X322RVARF, UCSMR1X322RVAS

Specifications

BrandOWC
Part Number2R4D42R4064P
Capacity64GB (2 x 32GB)
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2400 (PC4 19200)
CAS LatencyCL17
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemCisco UCS B420 M4
Cisco UCS C460 M4 (DDR4)

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Questions about this item

How do I install the 288-pin DDR4 RDIMMs in a Cisco UCS B420 M4 and what step is often missed?

Power down the server, open the chassis, align each 288-pin module with the keyed slot and press firmly until the ejector tabs lock; the step often missed is populating the correct channel slots in the order specified by the Cisco UCS B420 M4 memory population guide so that both 32 GB modules run as a matched pair.

What maintenance or replacement will the ECC registered kit need over time?

The modules themselves require no periodic maintenance; replacement is only needed if a DIMM fails or if you upgrade capacity beyond the 64 GB kit, at which point you must add identical 2Rx4 PC4-19200 CL17 1.2 V registered modules to keep ECC and registered operation consistent.

What limit appears first when the memory runs sustained workloads on the Cisco UCS C460 M4?

The DDR4 2400 CL17 1.2 V specification sets the maximum sustained data rate and latency; under continuous load the memory controller will throttle to stay within the JEDEC-defined thermal and timing envelope of the PC4-19200 modules.

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