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Two green DDR5 RDIMM modules, no heat spreaders, gold contacts

OWC

OWC 128GB (2x64GB) DDR5 4800 PC5-38400 CL40 2Rx4 288-pin 1.1V ECC Registered RDIMM server RAM

SKU CH-TSJ1-H3QKZ

Dual-channel 128 GB DDR5 kit with two 64 GB ECC registered RDIMMs at 4800 MT/s, CL40, 1.1 V for servers and workstations

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 128GB (2 x 64GB)

Show 4 more

Rank 2Rx4

  • 128 GB total capacity with two 64 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • ECC registered design detects and corrects data errors
  • CL40 latency at 1.1 V operating voltage
  • Dual-rank 2Rx4 organisation on 288-pin RDIMM form factor

Server-grade DDR5 ECC RDIMM kit

This OWC kit delivers 128 GB of DDR5 4800 memory in a matched pair of 64 GB registered DIMMs. It is built for workstations and servers that require error-correcting code and registered buffering for data integrity. Standard desktop platforms cannot use this memory type.

Registered DDR5 interface constraints

Registered DIMMs add a clock cycle of buffering that stabilises heavy loads but prevents use in consumer boards. The modules run at 1.1 V with CL40 latency and must be installed in pairs to maintain dual-channel operation. Mixing with unbuffered or load-reduced ECC memory is not supported.

Verify platform compatibility first

Confirm that your workstation or server explicitly supports DDR5 ECC RDIMM modules at 4800 MT/s. Check the qualified vendor list for 64 GB 2Rx4 density and 1.1 V operation. Systems limited to unbuffered or consumer DDR5 will not post with this kit.

How it compares

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

Price $2,647.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (2 × 64 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $20.69 per GB
Pricier than about 81% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D52R4128P
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
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 128 GB dual-channel kit or look for single 64 GB modules?

The kit ships as two matched 64 GB modules, giving 128 GB total in a dual-channel configuration; buying the kit ensures identical timings and voltage for server stability.

What does the 4800 speed rating deliver inside a workstation?

The modules run at 4800 MT/s with CL40 latency at 1.1 V, providing JEDEC-standard DDR5 throughput for registered ECC server workloads.

How does the 288-pin DDR5 ECC registered interface affect compatibility?

The 288-pin RDIMM form factor with registered ECC and 2Rx4 organisation fits only platforms that support DDR5 registered memory; it will not work in unbuffered desktop boards.

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