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Four green DDR4 RDIMM modules with gold contacts, no heat spreaders

OWC

OWC 128GB (4x32GB) DDR4 3200 CL22 ECC Registered RDIMM memory upgrade

SKU CH-M2EW-RFA5A

128 GB DDR4 ECC registered RDIMM kit (four 32 GB modules at 3200 MT/s, CL22, 1.2 V) validated for Cisco UCS B200 M6, C125 M5, C220 M6, C240 M6 and C245 M6 servers

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 3200 (PC4 25600)
  • CAS latencyCL22
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 128GB (4 x 32GB)

Show 3 more
  • 128 GB total capacity from four 32 GB modules
  • DDR4 3200 speed with CL22 latency for responsive server workloads
  • ECC registered design detects and corrects single-bit errors
  • 2 V operation lowers power draw in dense configurations
  • Validated for Cisco UCS B200 M6, C125 M5, C220 M6, C240 M6, C245 M6

Cisco UCS Server Upgrade

This 128GB kit contains four 32GB DDR4 3200 ECC Registered RDIMM modules built for Cisco UCS B200 M6, C125 M5, C220 M6, C240 M6 and C245 M6 servers. It is designed for administrators who need to expand memory capacity in these specific platforms.

Registered DIMM Installation

Each 288-pin module seats in a standard DDR4 RDIMM slot at 1.2V. The registered design adds a clock cycle, so the server must support registered memory and cannot mix these sticks with unbuffered or load-reduced types. Populating all four slots may require following the system’s population rules for 2Rx4 ranks.

Pre-Purchase Compatibility Check

Verify the server model matches the listed Cisco UCS part numbers exactly and confirm the BIOS revision supports 32GB registered modules. Ensure no unbuffered or load-reduced DIMMs remain installed, as mixing memory types will prevent the system from booting.

How it compares

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

Price $801.99
Pricier than about 58% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.27 per GB
Cheaper than about 63% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number3R2D42R4128S
Total capacity128 GB (4 × 32 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 3200 (PC4 25600)
Memory
CAS latencyCL22
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsCisco UCS B200 M6
Cisco UCS C125 M5
Cisco UCS C220 M6
Cisco UCS C240 M6
Cisco UCS C245 M6

Other versions of this model

5 more in the same range

Questions about this item

How can I verify the kit is running at DDR4 3200 CL22 after installation?

Check the BIOS or OS memory report; it should show four 32 GB modules operating at 3200 MT/s with CAS latency 22 and 1.2 V.

What ships in the box and what must I source separately?

The kit includes four 32 GB 288-pin DDR4 ECC Registered RDIMMs; no cables, tools or additional hardware are included.

Which capacity version should I choose for a Cisco UCS C240 M6?

This 128 GB kit (4 × 32 GB) matches the supported configuration for the C240 M6 and replaces Cisco part numbers 15-107238-01, UCSMRX32G2RW and UCSXMRX32G2RW.

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