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Four green DDR5 RDIMM modules with gold contacts and black chips, no heat spreaders

OWC

OWC 64GB (4x16GB) DDR5 5600 CL46 1Rx4 ECC Registered RDIMM Server Memory

SKU CH-JKJS-FMK28

A 64 GB DDR5 ECC registered RDIMM kit of four 16 GB modules running at 5600 MT/s with CL46 latency and 1.1 V operation for compatible workstations and servers

  • Capacity64GB (4 x 16GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 5600 (PC5 44800)
  • CAS LatencyCL46
  • Voltage1.1V
  • ECCYes

Capacity 64GB (4 x 16GB)

  • 64 GB total capacity from four 16 GB modules
  • DDR5 5600 speed rated at PC5-44800 bandwidth
  • CL46 CAS latency for registered server timing
  • ECC registered design detects and corrects data errors
  • 1 V operation reduces power draw in dense configs

64 GB DDR5 ECC Registered Kit

This OWC kit provides 64 GB of DDR5 5600 memory across four 16 GB modules. It uses 288-pin RDIMMs with ECC and registered buffering for error correction and signal integrity. The modules run at 1.1 V with a CAS latency of CL46. They are built for workstations, servers, NAS systems and network switches that require registered ECC memory.

For Registered ECC Platforms Only

The memory suits administrators upgrading or building systems that specifically support DDR5 registered ECC RDIMMs. It will not work in standard desktop computers or consumer motherboards that accept only unbuffered non-ECC modules. It also cannot be mixed with load-reduced or unbuffered ECC memory. Buyers needing unbuffered memory or consumer DDR5 should look elsewhere.

64 GB Capacity at DDR5 5600

Four 16 GB modules deliver 64 GB total, fitting four DIMM slots in a dual-channel configuration. The kit handles typical server workloads such as virtualization, database caching and file serving within the DDR5 5600 JEDEC standard. Systems requiring more than 64 GB or higher memory speeds will need additional modules or a faster-rated kit.

Highlights

  • 64 GB total capacity from four 16 GB modules
  • DDR5 5600 speed rated at PC5-44800 bandwidth
  • CL46 CAS latency for registered server timing
  • ECC registered design detects and corrects data errors
  • 1 V operation reduces power draw in dense configs

Specifications

BrandOWC
Part Number5R6D51R4064S
Capacity64GB (4 x 16GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 5600 (PC5 44800)
CAS LatencyCL46
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank1Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

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Questions about this item

Does my motherboard need 288-pin DDR5 slots that support ECC Registered RDIMMs at 1.1V?

Yes. This kit requires a workstation or server board with 288-pin DDR5 slots that accept ECC Registered RDIMMs running at 1.1V. Standard desktop boards cannot use it.

Can I keep my existing unbuffered ECC or load-reduced DIMMs and add these 1Rx4 modules?

No. Registered DIMMs must not be mixed with unbuffered or load-reduced memory. All slots should be populated with identical registered modules.

How can I confirm the kit is running at the rated 5600 MT/s CL46 after installation?

Check the memory speed and timings in the system BIOS or a hardware utility such as CPU-Z; they should report DDR5-5600 with CAS latency 46.

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