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Green rectangular RDIMM module with black chips and gold contacts

Crucial

Crucial MTC40F2046S1RC56BD1R 64GB DDR5 5600 RDIMM CL46 2Rx4 server RAM

SKU CH-W27K-WDT5C MPN MTC40F2046S1RC56BD1R

64 GB DDR5 RDIMM running at 5600 MHz with CL46 latency in a 2Rx4 configuration

  • 64 GB capacity enables large datasets in memory
  • DDR5 at 5600 MHz delivers high bandwidth for server workloads
  • RDIMM registered design improves signal integrity on multi-DIMM channels
  • CL46 latency supports responsive data access at speed
  • 2Rx4 organisation with 16 Gbit density optimises rank efficiency

Server DDR5 RDIMM

This Crucial 64 GB DDR5 RDIMM runs at 5600 MHz with CL46 latency and a 2Rx4 organisation. The registered form factor targets multi-socket servers and workstations that require ECC protection and higher capacities per slot.

Suits density-focused builds.

Builders who need maximum capacity in fewer DIMM slots and want DDR5 bandwidth with registered buffering will match this module. Systems that only accept UDIMMs or that are limited to lower memory speeds cannot use this stick.

Speed and form factor decide fit

The single specification that determines compatibility is the 5600 MHz RDIMM rating; the motherboard and CPU memory controller must explicitly support DDR5-5600 registered DIMMs for the module to operate.

How it compares

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

Price $925.99
Pricier than about 80% of the 6,523 comparable items (median $188.99).

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Specifications

Product
Brand nameCrucial
Size & build
Shipping weight0.45 kg
Package size76 × 25 × 25 mm

Questions about this item

What slot type and form factor does this 64 GB DDR5 RDIMM require?

It uses a standard DDR5 RDIMM slot; the module is a 288-pin registered DIMM designed for server motherboards that support DDR5 memory.

What is the correct way to seat this CL46 5600 MHz module, and what step is often missed?

Align the notch with the key in the slot, press firmly until both side latches click, then verify the module height clears any CPU cooler or airflow shroud.

How can I tell when this 2Rx4 16 Gbit kit needs replacement in a production server?

Replace it if the system logs show uncorrectable ECC errors, repeated memory-test failures, or if the module no longer trains at its rated 5600 MHz speed.

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