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Four green DDR5 RDIMM modules with black heatspreaders

Corsair

Corsair CMA64GX5M4B6400C32 64GB (4x16GB) DDR5 6400 CL32 ECC RDIMM server RAM

SKU CH-51AB-FH4VG MPN CMA64GX5M4B6400C32

64 GB quad-channel ECC registered DDR5 kit at 6400 MT/s with CL32 timings and 1.35 V operation

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetINTEL XMP 3.0
  • CAS latencyCL32
  • Memory timings32-40-40-104
  • Rated voltage1.35 V
  • 64 GB quad-channel kit expands workstation memory capacity
  • DDR5 6400 speed with CL32 latency accelerates data-intensive workloads
  • ECC registered design detects and corrects memory errors for reliability
  • Intel XMP 3.0 profile enables rated performance with a single BIOS setting
  • 35 V operating voltage improves efficiency under sustained high loads

64GB quad-channel ECC RDIMM kit

This Corsair WS RDIMM kit provides 64GB of DDR5 server memory across four 16GB registered modules. It targets workstations that need error-correcting capacity for high-end workloads and applications.

DDR5 6400 CL32 with XMP 3.0

Rated at DDR5 6400 (PC5 51200) with 32-40-40-104 timings and 1.35V, the kit delivers high frequency and tight latency for demanding tasks. Headroom scales up to 256GB when additional identical kits are installed.

288-pin registered design for workstation boards

The registered ECC modules require a compatible DDR5 RDIMM platform with quad-channel support. Intel XMP 3.0 simplifies configuration to rated speed without manual timing entry.

How it compares

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

Price $628.99
Pricier than about 73% 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 $9.83 per GB
Pricier than about 66% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameCORSAIR
Product lineWS RDIMM Series
Part numberCMA64GX5M4B6400C32
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Processor
ChipsetINTEL XMP 3.0
Memory
CAS latencyCL32
Memory timings32-40-40-104
ECC supportYes
Buffer typeRegistered
Kit configurationQuad Channel Kit
Power
Rated voltage1.35 V
Size & build
Shipping weight0.14 kg
Package size152 × 78 × 20 mm

Questions about this item

Will the 288-Pin DDR5 RDIMM form factor fit alongside existing DDR5 RDIMMs already installed in the server?

Yes, these modules use the standard 288-Pin DDR5 RDIMM form factor, so they occupy the same DIMM slots as any other DDR5 registered memory.

How can I confirm the kit is running at the rated DDR5 6400 speed and CL32 latency after installation?

Enable the Intel XMP 3.0 profile in the BIOS, then verify the operating frequency reads 6400 MT/s and timings show 32-40-40-104 in a tool such as CPU-Z or the firmware memory-info screen.

Does the package contain only the four 16 GB modules, or are any cables, brackets or additional cooling parts included?

The box holds the four 16 GB DDR5 RDIMM modules with their integrated heatspreaders; no extra cables, brackets or cooling accessories are supplied.

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