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

OWC

OWC 128GB (2x64GB) DDR5 5600 CL46 ECC Registered RDIMM server RAM

SKU CH-S3XJ-36M2N

Dual-channel 128GB kit with two 64GB DDR5 5600 CL46 ECC registered RDIMMs at 1.1V for servers

  • Capacity128GB (2 x 64GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 5600 (PC5 44800)
  • CAS LatencyCL46
  • Voltage1.1V
  • ECCYes

Capacity 128GB (2 x 64GB)

Show 4 more configurations

Rank 2Rx4

  • 128 GB kit (2 × 64 GB) expands server capacity
  • DDR5 5600 CL46 delivers high-speed data throughput
  • ECC registered design corrects errors for reliable uptime
  • 1 V operation reduces power draw per module
  • JEDEC-standard build ensures warranty-safe compatibility

128GB DDR5 ECC Registered Kit

This OWC kit provides 128GB of DDR5 server memory in a matched pair of 64GB modules. It runs at 5600 speed with a CL46 latency and operates at 1.1V. The modules use 288-pin RDIMM form factor with 2Rx4 rank organisation.

Suited for registered ECC platforms only

These modules are built for select workstations and servers that require registered ECC DDR5 memory. They will not work in standard desktop computers and cannot be mixed with unbuffered or load-reduced DIMMs. Buyers needing non-ECC or unbuffered memory should look elsewhere.

Registered ECC with 2Rx4 organisation

The registered buffer and ECC functionality are the decisive specification for compatibility. Your system must explicitly support DDR5 RDIMM modules with 2Rx4 rank structure. Verify your platform documentation before purchase.

Highlights

  • 128 GB kit (2 × 64 GB) expands server capacity
  • DDR5 5600 CL46 delivers high-speed data throughput
  • ECC registered design corrects errors for reliable uptime
  • 1 V operation reduces power draw per module
  • JEDEC-standard build ensures warranty-safe compatibility

Specifications

BrandOWC
Part Number5R6D52R4128P
Capacity128GB (2 x 64GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 5600 (PC5 44800)
CAS LatencyCL46
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

Other versions of this model

5 more in the same range

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

Questions about this item

How much power do the 1.1 V DDR5 5600 modules draw under sustained server load?

Each 64 GB RDIMM operates at 1.1 V, the standard JEDEC voltage for DDR5 5600, so total kit draw is determined by the platform memory controller rather than the modules themselves.

What motherboard features are required to run this 288-pin ECC Registered RDIMM kit?

The board must provide DDR5 RDIMM slots with registered-buffer support and ECC capability; standard desktop DDR5 slots that accept only unbuffered memory will not work.

Can I add these CL46 2Rx4 sticks to a system that already has DDR5 4800 ECC RDIMMs installed?

The memory controller will down-clock all modules to the lowest common speed and tightest shared timings, so the 5600 kit will run at 4800 with the existing DIMMs.

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