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Green rectangular DDR5 RDIMM module with black memory chips and gold contacts, no heat spreader

Kingston Technology Corp.

Kingston Technology Corp. KSM64R52BD4-128MB 128GB DDR5-6400 CL52 2Rx4 Registered ECC Server RAM

SKU CH-6V91-JWN72 MPN KSM64R52BD4-128MB

128 GB DDR5-6400 registered ECC RDIMM with CL52 latency for server workloads

  • Total capacity128 GB
  • Rated speedDDR5 6400 (PC5 51200)
  • CAS latencyCL52
  • Memory timings52-52-52
  • Rated voltage1.1 V
  • Buffer typeRegistered

Capacity 128GB

Rank 2Rx4

  • High 128 GB capacity handles large server workloads
  • DDR5 6400 speed delivers fast data throughput
  • Registered ECC design protects data integrity
  • CL52 latency supports responsive operation
  • 288-pin RDIMM form factor fits compatible slots

128 GB DDR5-6400 Registered ECC RDIMM

This module delivers 128 GB of DDR5-6400 memory with CL52 latency and registered ECC operation. It is built for servers and workstations that require high-capacity, error-correcting memory for data-intensive workloads.

Check motherboard DDR5 RDIMM support

Verify that your platform accepts 288-pin DDR5 RDIMMs at 6400 MT/s and can supply 1.10 V. Confirm the CPU and chipset support registered dual-rank 2Rx4 modules and that the BIOS is current for this speed.

Suits multi-socket servers needing maximum

Ideal for virtualization hosts, database nodes and compute clusters that benefit from 128 GB per slot. Not for consumer desktops, laptops or any system limited to unbuffered UDIMMs or lower memory speeds.

How it compares

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

Price $3,784.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $29.57 per GB
Pricier than about 90% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameKingston
Model nameKSM64R52BD4-128 MB
Total capacity128 GB
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Memory
CAS latencyCL52
Memory timings52-52-52
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Size & build
Shipping weight0.03 kg
Package size161 × 48 × 8 mm

Other versions of this model

3 more in the same range

Questions about this item

What comes with the KSM64R52BD4-128MB and is anything else needed?

The box contains the 128GB DDR5-6400 RDIMM module only; no heat spreader, cables or software are included. The server motherboard must provide a 288-pin DDR5 RDIMM slot and support ECC registered memory.

Why choose this 128GB 2Rx4 CL52 module over other capacities or ranks?

This specific part is a single 128GB stick organised as 2Rx4 with CL52 timing at 1.10V. Select it when the platform requires a registered ECC DIMM of exactly this density, rank geometry and latency.

What does DDR5-6400 CL52 mean for real server workloads?

The module runs at 6400 MT/s with 52-52-52 timings, giving low-latency registered ECC throughput for virtualisation, databases and compute tasks on compatible DDR5 server platforms.

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