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Four black DDR5 RDIMM modules with silver heatspreaders

Corsair

Corsair CMA64GX5M4B6000Z40 64GB (4x16GB) DDR5 6000 CL40 ECC RDIMM server RAM

SKU CH-Z2B9-KG113 MPN CMA64GX5M4B6000Z40

64 GB quad-channel DDR5 kit with ECC registered modules at 6000 MT/s CL40 for workstation reliability

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR5 6000 (PC5 48000)
  • ChipsetINTEL XMP 3.0 & AMD EXPO
  • CAS latencyCL40
  • Memory timings40-40-40-77
  • Rated voltage1.35 V
  • 64 GB total capacity from four 16 GB modules
  • ECC registered design detects and corrects single-bit errors
  • DDR5 6000 speed with CL40 latency for responsive throughput
  • Quad-channel kit layout maximises bandwidth on supported platforms
  • Intel XMP 3.0 and AMD EXPO profiles enable one-click configuration

Workstation DDR5 RDIMM kit

This Corsair WS RDIMM kit delivers 64 GB of registered ECC DDR5 memory across four 16 GB modules. It targets workstations that require error-correcting registered DIMMs for high-end workloads and applications. The quad-channel configuration maximises installed memory on compatible platforms.

64 GB capacity with CL40 timings

The kit runs at DDR5 6000 with timings of 40-40-40-77 and a CAS latency of CL40 at 1.35 V. This headroom handles large datasets, virtualisation and content-creation tasks while ECC registration protects data integrity. Capacity tops out at 256 GB when the platform supports larger populations.

Quad-channel registered ECC integration

The 288-pin RDIMM form factor requires a workstation motherboard that supports registered ECC DDR5 and quad-channel operation. Intel XMP 3.0 and AMD EXPO profiles simplify configuration to rated speed without manual tuning. Builders needing unbuffered UDIMMs or higher frequencies must select a different memory type.

How it compares

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

Price $879.99
Pricier than about 79% 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 $13.75 per GB
Pricier than about 74% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameCORSAIR
Product lineWS RDIMM Series
Part numberCMA64GX5M4B6000Z40
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6000 (PC5 48000)
Processor
ChipsetINTEL XMP 3.0 & AMD EXPO
Memory
CAS latencyCL40
Memory timings40-40-40-77
ECC supportYes
Buffer typeRegistered
Kit configurationQuad Channel Kit
Power
Rated voltage1.35 V
Size & build
Shipping weight0.14 kg
Package size156 × 91 × 20 mm

Questions about this item

Will the 288-pin DDR5 RDIMM modules fit in a motherboard that currently uses DDR5 RDIMMs?

Yes, the 288-pin DDR5 RDIMM form factor matches standard DDR5 RDIMM slots, so the four 16GB modules install directly into compatible workstation boards.

How can I verify the kit is running at DDR5 6000 with CL40 timings after installation?

Enable the Intel XMP 3.0 or AMD EXPO profile in the BIOS, then confirm the operating speed shows 6000 MT/s and timings read 40-40-40-77 in your system information utility.

Does the 64GB quad-channel kit include only the four 16GB RDIMMs or are extra accessories supplied?

The package contains the four 16GB DDR5 RDIMM modules; no additional cables, brackets or software licences are included.

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