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Green rectangular circuit board with gold edge connectors and black memory chips on both sides

OWC

OWC 128GB DDR4 2933 PC4-23400 CL21 8Rx4 288-pin 1.2V ECC RDIMM memory upgrade

SKU CH-Q777-WH9CB

A single 128GB DDR4 2933 ECC registered RDIMM for Cisco HyperFlex HX220c M5, HX240c M5 and compatible servers

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latency21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128 GB capacity expands server memory headroom
  • DDR4 2933 MT/s speed supports high-throughput workloads
  • ECC registered design protects data integrity in critical systems
  • 2 V operation reduces power draw per module
  • Validated for Cisco HyperFlex HX220c M5, HX240c M5, HXAF220c M5 and ASUS RS720-E9-RS12-E

Server Memory Upgrade

This single 128GB DDR4 2933 PC4-23400 CL21 8Rx4 288-pin 1.2V ECC Registered RDIMM is built for Cisco HyperFlex HX220c M5, HX240c M5, HXAF220c M5, HX-E-220M5SX and ASUS RS720-E9-RS12-E servers. It adds high-density error-correcting capacity to workloads that demand data integrity and uptime.

Replaces Lower-Capacity RDIMMs

The module fits slots currently populated with smaller registered ECC DIMMs running at 2133, 2400 or 2666 MHz, raising total system memory without changing voltage or rank configuration. The jump is worth it when virtualisation density, in-memory databases or large dataset caching exceed the existing memory ceiling.

Sustained Load Behaviour

JEDEC-standard timings and 1.2V operation keep power draw stable during extended compute cycles, while registered buffering reduces electrical load on the memory controller. ECC correction runs continuously, preventing silent data corruption during long-running batch jobs or always-on database services.

How it compares

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

Price $652.99
Pricier than about 55% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
CAS latency 21
Lower than about 63% of the 483 comparable items (median 22).
Price per GB $5.10 per GB
Cheaper than about 75% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latency21
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsCisco HyperFlex HX220c M5
Cisco HyperFlex HX240c M5
Cisco HyperFlex HXAF220c M5
Cisco HyperFlex HX-E-220M5SX
ASUS Rack Server RS720-E9-RS12-E

Questions about this item

Does the 288-pin DDR4 RDIMM fit the Cisco HyperFlex HX220c M5 server?

Yes, the 288-pin DDR4 ECC RDIMM is listed as compatible with the Cisco HyperFlex HX220c M5, HX240c M5, HXAF220c M5 and HX-E-220M5SX servers.

How do I install the 128GB module, and what step is often missed?

Power down the server, open the chassis, align the notch on the 288-pin RDIMM with the DIMM slot key, press firmly until both ejector clips click shut, then verify the module is recognised in BIOS.

Will the 8Rx4 ECC registered module need any firmware updates or battery replacements later?

No firmware or battery maintenance is required for the DDR4 ECC RDIMM; if a memory error appears, reseat or replace the module.

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