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Four green DDR5 RDIMM modules in a row

OWC

OWC 64GB (4×16GB) DDR5 4800 CL40 ECC Registered RDIMM server RAM

SKU CH-CHMW-X8Y2X

A 64 GB DDR5 ECC registered RDIMM kit of four 16 GB modules running at 4800 MT/s CL40 1.1 V for compatible workstations and servers

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank1Rx8

Capacity 64GB (4 x 16GB)

Show 4 more

Rank 1Rx8

  • ECC registered design protects data integrity in servers
  • 64 GB total capacity across four 16 GB modules
  • DDR5 4800 speed with CL40 latency for responsive performance
  • 1 V operation reduces power draw in dense configs
  • JEDEC compliant and ROHS certified for broad compatibility

Server DDR5 ECC RDIMM kit

This 64GB kit contains four 16GB DDR5 4800 CL40 registered DIMMs built for compatible workstations and servers. Each module runs at 1.1V with a 1Rx8 organisation and ECC protection. The 288-pin form factor follows JEDEC PC5-38400 specifications.

Registered ECC cannot mix with unbuffered

Registered ECC memory will not operate in standard desktop platforms that expect unbuffered modules. It also cannot be combined with load-reduced ECC DIMMs in the same system. Buyers needing memory for consumer motherboards or mixed ECC types must choose a different product.

4800 MT/s JEDEC standard speed

The kit operates at the DDR5 4800 (PC5-38400) baseline with CL40 latency. Systems requiring higher factory-rated frequencies or lower latencies will not reach those targets with this module.

How it compares

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

Price $1,514.99
Pricier than about 84% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $23.67 per GB
Pricier than about 85% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D51R8064S
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank1Rx8
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

Should I buy the 64GB kit or look for a different capacity?

This kit provides 64GB total across four 16GB modules, designed for dual-channel server platforms that support registered ECC DDR5.

What does the 4800 speed rating deliver in a live system?

The modules run at DDR5 4800 (PC5-38400) with CL40 latency at 1.1V, giving JEDEC-standard bandwidth for compatible workstations and servers.

Will the 288-pin registered ECC interface work in my motherboard?

These are 288-pin DDR5 RDIMMs with ECC and registered buffering; they require a server or workstation board that explicitly supports registered ECC DDR5 and cannot be used in standard desktop slots.

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