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Eight green DDR5 RDIMM modules in anti-static tray

OWC

OWC 128GB (8x16GB) DDR5 5600 PC5-44800 CL46 1Rx4 288-pin 1.1V ECC Registered RDIMM Server RAM

SKU CH-K88X-CC40S

Eight 16 GB DDR5 5600 registered ECC modules add 128 GB of error-correcting capacity for servers and workstations

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR5 5600 (PC5 44800)
  • CAS latencyCL46
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank1Rx4

Capacity 128GB (8 x 16GB)

  • 128GB total capacity from eight 16GB modules
  • DDR5 5600 speed rated at PC5-44800 bandwidth
  • CL46 CAS latency at 1.1V operating voltage
  • ECC registered design for server data integrity
  • JEDEC and ROHS compliant for warranty-safe upgrades

OWC 128GB DDR5 5600 ECC RDIMM Kit

This kit provides 128GB of DDR5 5600 registered ECC memory in eight 16GB modules. It is built for workstations and servers that require 288-pin RDIMM modules with error correction. The memory operates at 1.1V and meets JEDEC PC5-44800 specifications. Standard desktop systems cannot use this registered ECC memory.

Capacity and headroom for virtualization workloads

Eight 16GB modules deliver 128GB total capacity for multi-VM environments and large dataset handling. CL46 latency at 5600 MT/s supports sustained throughput in dual-channel configurations. The 1Rx4 organization fits dense memory slots without exceeding rank limits. Systems needing more than 128GB or unbuffered memory must choose a different kit.

Thermals noise and power at 1.1V

Modules run at the JEDEC standard 1.1V without a heat spreader, relying on chassis airflow for cooling. Low voltage reduces power draw per DIMM in populated server boards. Passive operation adds no fan noise to the system. Dense 8-module populations need adequate case ventilation to maintain stable temperatures.

How it compares

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

Price $3,561.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (8 × 16 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $27.83 per GB
Pricier than about 89% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number5R6D51R4128K
Total capacity128 GB (8 × 16 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Memory
CAS latencyCL46
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.1 V

Other versions of this model

5 more in the same range

Questions about this item

Will these 1Rx4 registered DDR5 modules work alongside existing 2Rx4 RDIMMs in my server?

Mixing different rank configurations such as 1Rx4 with 2Rx4 is not recommended; the kit is designed to run as a matched 128GB set of eight 16GB modules at DDR5 5600 CL46 1.1V.

How can I verify the kit is running at PC5-44800 after installation?

Check the BIOS or UEFI memory information screen; it should report DDR5 5600 speed, CL46 latency, 1.1V voltage and registered ECC operation for all eight DIMMs.

Does the box include any heat spreaders or only the eight bare 288-pin RDIMMs?

The modules ship without heat spreaders; the package contains the eight 16GB DDR5 5600 CL46 1Rx4 1.1V ECC registered RDIMMs and nothing else.

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