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Two green DDR5 RDIMM modules with gold contacts and black chips, no heat spreader

OWC

OWC 256GB (2x128GB) DDR5 5200 PC5-41600 CL42 4Rx4 288-pin 1.1V ECC Registered RDIMM server RAM

SKU CH-TTQY-F8TEE

A 256 GB dual-channel DDR5 kit with ECC registered RDIMMs running at 5200 MT/s, CL42 and 1.1 V for servers and workstations

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 5200 (PC5 41600)
  • CAS latencyCL42
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 256GB (2 x 128GB)

Show 4 more

Rank 4Rx4

  • 256 GB total capacity from two 128 GB modules
  • DDR5 5200 speed rated at PC5-41600 bandwidth
  • ECC registered design detects and corrects data errors
  • 1 V operation reduces power draw in servers
  • JEDEC and RoHS compliant for warranty-safe upgrades

Server ECC registered kit

This OWC kit provides 256GB of DDR5 server memory as two 128GB registered DIMMs. It is built for workstations, NAS systems, servers and network switches that require ECC registered modules. Standard desktop computers cannot use this memory.

DDR5 5200 registered limits

The modules run at DDR5 5200 (PC5-41600) with CL42 latency at 1.1V. Registered DIMMs add a buffer that increases signal integrity but also adds one cycle of latency compared with unbuffered memory. Mixing these with unbuffered or load-reduced ECC modules is not supported.

Compatibility check before ordering

Verify that your system explicitly supports 288-pin DDR5 ECC registered RDIMMs and 4Rx4 rank organisation. Confirm the motherboard or server documentation lists 128GB per slot at this speed. Ensure you are not mixing with unbuffered or load-reduced memory.

How it compares

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

Price $6,932.99
Pricier than about 91% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $27.08 per GB
Pricier than about 88% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number5R2D54R4256P
Total capacity256 GB (2 × 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

Should I pick the single 256 GB module or the 2 x 128 GB kit for my server?

The product is sold as a 2 x 128 GB dual-channel kit, giving 256 GB total across two registered DIMMs.

What does the DDR5 5200 PC5-41600 rating deliver in a real workload?

It runs at 5200 MT/s with CL42 latency at 1.1 V, providing JEDEC-standard bandwidth for registered ECC server platforms.

How does the 288-pin registered ECC interface limit compatibility?

The modules are 288-pin DDR5 RDIMMs with on-die ECC and register buffering, so they only work in workstations or servers that support registered DDR5 memory.

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