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Four green DDR5 RDIMM modules without heat spreaders

OWC

OWC 512GB (4x128GB) DDR5 5200 CL42 4Rx4 ECC Registered RDIMM server RAM

SKU CH-3W66-YG36X

Four 128 GB DDR5 5200 CL42 ECC registered RDIMMs deliver 512 GB of error-correcting server memory at 1.1 V

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR5 5200 (PC5 41600)
  • CAS latencyCL42
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 512GB (4 x 128GB)

Show 4 more

Rank 4Rx4

  • 512 GB total capacity from four 128 GB modules
  • DDR5 5200 speed with CL42 latency for server workloads
  • ECC registered design detects and corrects memory errors
  • JEDEC-standard 1.1 V operation reduces power draw
  • 288-pin RDIMM form factor fits compatible workstations and servers

Server-grade DDR5 kit for workstations and NAS

This OWC kit delivers 512GB of DDR5 5200 registered ECC memory across four 128GB modules. The 288-pin RDIMMs operate at 1.1V with CL42 latency and 4Rx4 organisation. It targets administrators upgrading select workstations, NAS systems or network switches that require registered error-correcting modules.

Replaces unbuffered or lower-capacity registered

The jump is worthwhile when your platform demands registered ECC memory and needs the density of 128GB modules to reach 512GB in four slots. Systems limited to unbuffered ECC or load-reduced DIMMs cannot use this kit. The dual-channel kit layout suits boards that populate two channels with two modules each.

Verify registered ECC support

Confirm the motherboard or server manual lists DDR5 5200 registered RDIMMs with 4Rx4 organisation as compatible. Check that four 288-pin slots are available and that the BIOS accepts 128GB density per module. Mixing with unbuffered or load-reduced memory is not supported.

How it compares

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

Price $14,552.99
Pricier than about 92% of the 6,523 comparable items (median $188.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 91% of the 6,064 comparable items (median 32 GB).
Price per GB $28.42 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 number5R2D54R4512S
Total capacity512 GB (4 × 128 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 5200 (PC5 41600)
Memory
CAS latencyCL42
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
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

Does the 288-pin DDR5 RDIMM form factor fit standard server DIMM slots?

Yes, each 128GB module uses the 288-pin DDR5 RDIMM form factor designed for server and workstation DIMM slots.

What is the correct seating procedure for these registered ECC modules, and what step is often missed?

Align the notch with the slot key, press firmly until both retention clips click, then verify the motherboard recognises all 512GB at 5200 MT/s.

When should the 4Rx4 registered DIMMs be replaced or checked for errors?

Run a full memory test at install; replace any module that logs correctable ECC errors consistently or fails the test.

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