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Eight green DDR4 RDIMM modules with gold contacts and black chips

OWC

OWC 128GB (8x16GB) DDR4 2933 PC4-23400 CL21 1Rx4 288-pin 1.2V ECC Registered RDIMM memory upgrade

SKU CH-FECB-RW89F

ECC registered 288-pin DDR4 kit adds 128 GB across eight 16 GB modules at 2933 MHz CL21 for Cisco HX and C480 M5 servers

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank1Rx4

Capacity 128GB (8 x 16GB)

  • 128 GB total capacity from eight 16 GB modules
  • ECC registered design protects data integrity in servers
  • DDR4 2933 MT/s speed with CL21 latency
  • Low 1.2 V voltage reduces power draw
  • Compatible with Cisco HX220c M5 and HX240c M5

Server-grade ECC RDIMM kit

This 128GB kit contains eight 16GB DDR4 2933 registered DIMMs with ECC and CL21 latency. It is built for Cisco HX220c M5, HX240c M5, HXAF220c M5, HX-E-220M5SX and C480 ML M5 servers and workstations that require registered memory. The modules operate at 1.2V and use a 1Rx4 organisation.

Verify registered ECC requirement

Your system must support DDR4 288-pin ECC registered RDIMMs; unbuffered or load-reduced DIMMs will not work alongside these modules. Confirm the motherboard accepts 1Rx4 density and can run at 2933MHz, 2666MHz, 2400MHz or 2133MHz. Check that all eight slots are free or that the existing population rules allow adding this 128GB configuration.

Fills eight slots for maximum capacity

The kit occupies eight DIMM slots and delivers 128GB of registered ECC memory, freeing you from mixing different module sizes or speeds. It replaces Cisco part numbers HXMRX16G1RTH and UCSMRX16G1RTH directly. The registered buffer reduces electrical load on the memory controller, helping stability in dense server configurations.

How it compares

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

Price $905.99
Pricier than about 60% 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 $7.08 per GB
Cheaper than about 57% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D41R4128K
Total capacity128 GB (8 × 16 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsCisco HX220c M5
Cisco HX240c M5
Cisco HXAF220c M5
Cisco HX-E-220M5SX
Cisco C480 ML M5

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Questions about this item

What does the 128GB kit contain and is anything else needed for installation?

The kit includes eight 16GB DDR4 2933 ECC Registered RDIMM modules. No additional parts are required; the modules install directly into the 288-pin DIMM slots of the listed Cisco servers.

Should I choose the 128GB kit or a smaller capacity for my Cisco HX220c M5?

Choose the 128GB (8x16GB) kit when you need to populate all eight slots with 16GB modules for maximum supported memory. Select a smaller kit only if your configuration calls for fewer modules or lower total capacity.

What does the 2933MHz rating mean once the modules are running in a Cisco C480 ML M5?

The modules operate at 2933MHz CL21 at 1.2V. They also run at 2666MHz, 2400MHz or 2133MHz if the system memory controller is set to a lower speed.

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