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Eight green DDR4 RDIMM modules with gold contacts and black chips, no heat spreaders

OWC

OWC 128GB (8x16GB) DDR4 2400 CL17 ECC Registered RDIMM 288-pin 1.2V Cisco UCS B200 M4 C220 M4

SKU CH-EK02-9HAS5

A 128 GB kit of eight 16 GB DDR4 2400 CL17 ECC registered RDIMMs for Cisco UCS B200 M4 and C220 M4 servers

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank1Rx4

Capacity 128GB (8 x 16GB)

  • 128GB capacity across 8 modules expands server memory headroom
  • DDR4 2400 CL17 at 1.2V delivers registered ECC reliability
  • 288-pin RDIMM form factor fits Cisco UCS B200 M4 and C220 M4
  • 1Rx4 organisation optimises signal integrity for dense configurations
  • Replaces Cisco part numbers UCSMR1X161RVA and UCSMR1X161RVG for direct compatibility

Server-grade memory kit

This 128GB kit contains eight 16GB DDR4 2400 CL17 ECC registered RDIMMs built for Cisco UCS B200 M4 and C220 M4 servers. Each module runs at 1.2V with a 1Rx4 organisation and no heat spreader. It is designed for workstation and server platforms that require registered ECC memory and will not work in standard desktop systems.

Sustained workload behaviour

Registered buffering and ECC correction keep data integrity stable during continuous multi-threaded tasks such as virtualisation, database serving or long render jobs. The CL17 latency at 2400MHz delivers predictable throughput without the error accumulation that can degrade unbuffered memory over extended periods. Modules are validated to JEDEC PC4-19200 specifications for reliable 24/7 operation.

Installation notes

Install all eight modules in matched channels according to the Cisco server memory population guide for the B200 M4 or C220 M4. Do not mix these registered DIMMs with unbuffered or load-reduced ECC memory, as the systems will not post. The 288-pin form factor fits only DDR4 registered slots; desktop DDR4 slots are physically incompatible and will not accept the modules.

How it compares

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

Price $765.99
Pricier than about 57% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (8 × 16 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $5.98 per GB
Cheaper than about 65% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R4D41R4128K
Total capacity128 GB (8 × 16 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Memory
CAS latencyCL17
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsCisco UCS B200 M4
Cisco UCS C220 M4

Other versions of this model

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Questions about this item

How much heat and power does the 128 GB DDR4 2400 kit draw when the server runs continuously?

Each 16 GB module operates at 1.2 V without a heat spreader; the registered ECC design keeps power draw low for 24/7 server workloads.

What must the Cisco UCS B200 M4 or C220 M4 already have for this 8-module kit to work?

The server needs free 288-pin DDR4 RDIMM slots that support registered ECC memory; mixing with unbuffered or load-reduced DIMMs is not supported.

Can I add this 1Rx4 CL17 kit alongside older Cisco UCS memory such as part numbers UCSMR1X161RVA or UCSMR1X161RVG?

Yes, the kit replaces those Cisco part numbers directly, so it will operate with matching registered ECC modules already installed in the same server.

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