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Eight green DDR5 RDIMM modules in static bags

OWC

OWC 256GB (8x32GB) DDR5 4800 CL40 ECC Registered RDIMM server RAM

SKU CH-B0MC-5YM7G

Eight 32 GB DDR5 4800 CL40 ECC registered RDIMMs totalling 256 GB at 1.1 V for servers and workstations

  • Total capacity256 GB (8 × 32 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx8

Capacity 256GB (8 x 32GB)

Show 4 more

Rank 2Rx8

  • 256 GB total capacity from eight 32 GB modules
  • DDR5 4800 speed with CL40 latency for responsive server workloads
  • ECC registered design detects and corrects data errors in critical applications
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • 1 V operation reduces power draw in dense configurations

Server ECC RDIMM kit

This OWC kit supplies 256 GB of DDR5 memory across eight registered DIMMs. Each module is a 32 GB 2Rx8 part rated at 4800 MT/s with CL40 latency and 1.1 V operation. The kit targets workstations and servers that require error-correcting registered memory.

JEDEC compliant build

Modules follow the 288-pin DDR5 RDIMM standard and carry no heat spreader. Registered buffering and on-die ECC protect data integrity in multi-socket platforms. The 2Rx8 organisation suits high-capacity configurations where signal integrity matters.

Verify platform requirements

Confirm your motherboard supports DDR5 registered ECC RDIMMs and accepts 2Rx8 modules at 4800 MT/s. This memory will not work in standard desktop boards or alongside unbuffered or load-reduced DIMMs. Check the vendor qualified-vendor list before ordering.

How it compares

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

Price $6,644.99
Pricier than about 91% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB (8 × 32 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $25.96 per GB
Pricier than about 87% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D52R8256K
Total capacity256 GB (8 × 32 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank2Rx8
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

What does the DDR5 4800 (PC5-38400) standard mean for real-world throughput?

The modules run at the JEDEC-standard 4800 MT/s data rate; actual throughput is determined by the platform's memory controller and channel configuration.

What physical slot and clearance do these 288-pin RDIMMs require?

They fit standard DDR5 288-pin RDIMM sockets and have no heat spreader, so they occupy only the module height defined by the JEDEC form factor.

How are the eight 32 GB sticks installed for correct dual-channel operation?

Populate the eight DIMM slots according to the motherboard's channel map — typically one module per channel per socket — and ensure all slots in a channel are filled identically to maintain 2Rx8 organisation.

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