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Eight black DDR5 RDIMM sticks with silver heatspreaders and gold contacts

Corsair

Corsair CMA128GX5M8B5600C40 128GB (8×16GB) DDR5 5600 CL40 ECC Registered server RAM

SKU CH-91E1-N88BC MPN CMA128GX5M8B5600C40

Eight 16 GB DDR5 RDIMMs totalling 128 GB at 5600 MT/s with CL40 ECC registered operation for workstation reliability

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR5 5600 (PC5 44800)
  • ChipsetINTEL XMP 3.0
  • CAS latencyCL40
  • Memory timings40-40-40-77
  • Rated voltage1.25 V
  • ECC registered design protects data integrity for critical workloads
  • 128 GB capacity in eight 16 GB modules maximises workstation memory
  • DDR5 5600 speed with CL40 timings accelerates high-end applications
  • Intel XMP 3.0 support enables rated performance through a single BIOS setting
  • 25 V operation improves efficiency under sustained heavy loads

128GB DDR5 RDIMM kit for workstations

This Corsair WS RDIMM kit delivers 128GB across eight 16GB modules. It runs at DDR5 5600 with CL40 timings and operates at 1.25V. ECC registered design targets high-end workstation workloads that demand data integrity.

Check motherboard support for registered ECC DDR5

Verify your platform accepts 288-pin DDR5 RDIMMs with ECC and registered buffering. The kit uses Intel XMP 3.0 profiles for rated speed; confirm your BIOS exposes XMP for registered modules. Ensure eight DIMM slots are available for the full 128GB capacity.

Fills eight slots for maximum registered capacity

Eight modules populate all channels on compatible workstation boards, reaching 128GB without mixing kits. Registered signalling reduces electrical load on the memory controller at high densities. XMP 3.0 simplifies configuration to the rated 5600 MT/s profile.

How it compares

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

Price $1,790.99
Pricier than about 85% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (8 × 16 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $13.99 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 numberCMA128GX5M8B5600C40
Total capacity128 GB (8 × 16 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
Power
Rated voltage1.25 V
Size & build
Shipping weight0.27 kg
Package size155 × 78 × 41 mm

Questions about this item

What comes in the box and do I need anything else to install the 288-Pin DDR5 RDIMM modules?

The kit includes eight 16GB DDR5 5600 RDIMM modules with heatspreaders; no extra parts are required for installation in a compatible server or workstation board.

Which capacity kit should I pick — 64GB, 128GB or 256GB — for a workstation that needs maximum registered ECC memory?

Choose the 128GB (8×16GB) kit to fill eight slots with registered ECC DDR5 5600 CL40 memory, or scale to 64GB or 256GB kits depending on your slot count and workload.

What does the DDR5 5600 (PC5 44800) rating deliver once the XMP 3.0 profile is enabled in the BIOS?

Enabling the Intel XMP 3.0 profile sets the modules to 5600 MT/s at CL40-40-40-77 timings and 1.25V, giving registered ECC bandwidth of PC5 44800 for high-end workloads.

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