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Four black DDR5 RDIMM modules with low-profile heatspreaders and gold contacts

Corsair

Corsair CMA128GX5M4B5600C40 128GB (4×32GB) DDR5 5600 CL40 ECC Registered server RAM

SKU CH-9ACZ-ATRA7 MPN CMA128GX5M4B5600C40

128GB quad-channel DDR5 ECC registered memory kit with four 32GB modules at 5600MT/s CL40 for workstation reliability

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 5600 (PC5 44800)
  • ChipsetINTEL XMP 3.0
  • CAS latencyCL40
  • Memory timings40-40-40-77
  • Rated voltage1.25 V
  • 128 GB quad-channel capacity scales workstation memory to 256 GB maximum
  • ECC registered operation protects data integrity for mission-critical workloads
  • DDR5 5600 speed with CL40 latency accelerates high-end applications
  • Intel XMP 3.0 profile enables rated performance through a single BIOS setting
  • 25 V DDR5 voltage improves efficiency under sustained heavy loads

128GB Quad-Channel DDR5 RDIMM Kit

This Corsair WS RDIMM kit provides 128GB of registered ECC DDR5 memory in four 32GB modules. It is built for workstations that need high-capacity, error-correcting RAM for demanding professional workloads. The registered design adds stability when all slots are populated.

DDR5 5600 CL40 Registered ECC Limits

The kit runs at DDR5 5600 (PC5 44800) with CL40 40-40-40-77 timings at 1.25V. Registered ECC modules require a motherboard and CPU that support registered DDR5 and ECC functionality; consumer platforms without this support cannot use these DIMMs. Intel XMP 3.0 profiles simplify configuration on compatible hardware.

Verify Workstation Platform Support

Before ordering, confirm your workstation motherboard accepts 288-pin DDR5 RDIMMs and supports registered ECC operation at the rated speed. Check the qualified vendor list for four-module population rules and maximum capacity per channel. Ensure the CPU memory controller is validated for quad-channel registered ECC configurations.

How it compares

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

Price $679.99
Pricier than about 75% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $5.31 per GB
Cheaper than about 71% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameCORSAIR
Product lineWS RDIMM Series
Part numberCMA128GX5M4B5600C40
Total capacity128 GB (4 × 32 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Processor
ChipsetINTEL XMP 3.0
Memory
CAS latencyCL40
Memory timings40-40-40-77
ECC supportYes
Buffer typeRegistered
Kit configurationQuad Channel Kit
Power
Rated voltage1.25 V
Size & build
Shipping weight0.09 kg
Package size160 × 78 × 20 mm

Questions about this item

Should I choose the 128GB quad-channel kit or a smaller 64GB option?

The 128GB kit provides four 32GB modules for quad-channel bandwidth, while 64GB kits use fewer modules and reduce total capacity.

What does DDR5 5600 (PC5 44800) deliver in a workstation?

It runs at 5600 MT/s with CL40 timings, giving high throughput for memory-intensive workloads when XMP 3.0 is enabled.

How does the 288-pin RDIMM interface affect compatibility?

The registered 288-pin DDR5 RDIMM form factor requires a workstation or server motherboard with RDIMM slots and chipset support.

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