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Green 288-pin DDR5 RDIMM module with black chips, no heat spreader

OWC

OWC 128GB DDR5 5600 PC5-44800 CL46 4Rx4 288-pin 1.1V ECC Registered RDIMM server RAM

SKU CH-63G1-371DD

A 128 GB DDR5 registered ECC module running at 5600 MT/s with CL46 latency and 1.1 V operation

  • Total capacity128 GB
  • Rated speedDDR5 5600 (PC5 44800)
  • CAS latencyCL46
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 128GB

Show 4 more

Rank 4Rx4

  • 128GB single-module capacity expands server memory density
  • DDR5 5600 speed delivers high throughput for demanding workloads
  • ECC registered design protects data integrity in critical applications
  • JEDEC-standard 1.1V operation ensures broad platform compatibility
  • 4Rx4 organisation maximises rank efficiency per channel

Capacity & Role

This OWC module delivers 128GB of DDR5 server memory in a single registered DIMM. It targets workstations and servers that require ECC protection and registered signalling for data integrity. Standard desktop platforms cannot use this module, and it must not be mixed with unbuffered or load-reduced memory.

Build & Compatibility

The 288-pin RDIMM follows JEDEC and ROHS standards for warranty-safe installation in qualified systems. A 4Rx4 organisation and CL46 latency define its electrical interface, while the absence of a heat spreader keeps the profile low for dense server chassis. Matching capacity, speed and vendor across all slots is recommended for optimal operation.

Thermals & Power

Operating at 1.1V, the module draws minimal power for its density, reducing thermal load in multi-DIMM configurations. Without a spreader, airflow across the PCB becomes the primary cooling path, so adequate case ventilation is necessary. Registered buffering adds negligible latency while stabilising the memory bus under sustained server workloads.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $3,649.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $28.52 per GB
Pricier than about 90% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number5R6D54R4128G
Total capacity128 GB
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Memory
CAS latencyCL46
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.1 V

Other versions of this model

5 more in the same range

Questions about this item

Does the DDR5 5600 interface cap at PC5-44800 bandwidth in this module?

Yes, the DDR5 5600 rating corresponds to a PC5-44800 data rate, which is the maximum standard bandwidth for this module.

What physical slot and pin count does this 288-pin RDIMM require?

It requires a standard 288-pin DDR5 DIMM slot on a server or workstation motherboard that supports registered ECC memory.

How is the module installed, and what compatibility step is often missed?

Align the notch with the DDR5 key in the slot, press firmly until the latches click, and verify the platform supports registered ECC RDIMMs — not unbuffered or load-reduced types.

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