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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

  • Capacity128GB (2 x 64GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 128GB (2 x 64GB)

Show 4 more configurations

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.

Highlights

  • 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

Specifications

BrandOWC
Part Number4R8D52R4128P
Capacity128GB (2 x 64GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

Other versions of this model

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Same family, different memory, cooler or clock — compare before you commit.

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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