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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

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 5600 (PC5 44800)
  • CAS latencyCL46
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 128GB (2 x 64GB)

Show 4 more

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.

How it compares

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

Price $3,484.99
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 $27.23 per GB
Pricier than about 89% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number5R6D52R4128P
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Memory
CAS latencyCL46
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.1 V

Other versions of this model

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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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