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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

  • Capacity64GB (4 x 16GB)
  • Type288-Pin DDR5 RDIMM
  • SpeedDDR5 6400 (PC5 51200)
  • CAS LatencyCL32
  • Timing32-40-40-104
  • Voltage1.35V
  • 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.

Highlights

  • 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

Specifications

BrandCORSAIR
SeriesWS RDIMM Series
Part NumberCMA64GX5M4B6400C32
Capacity64GB (4 x 16GB)
Type288-Pin DDR5 RDIMM
SpeedDDR5 6400 (PC5 51200)
CAS LatencyCL32
Timing32-40-40-104
Voltage1.35V
ECCYes
Buffered/RegisteredRegistered
Multi-channel KitQuad Channel Kit
ChipsetINTEL XMP 3.0
FeaturesDesigned for Workstations: High-performance, reliable DDR5 memory designed for high-end workloads and applications.
Intel XMP Compatible ECC RDIMMs: Complete tasks quicker thanks to high-frequencies and tight timings with ECC Registered DDR5 Memory.
Rigorously tested: Carefully selected and screened modules ensure you can reliably reach the performance you need.
Maximize installed memory: Get the most from your workstation with kits available from 64GB all the way up to 256GB.
Simple Setup with Intel XMP 3.0: Easily set your memory to its rated speed and performance with a simple BIO
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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