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Green circuit board with black memory chips, gold edge connector, no heat spreader

Kingston Technology Corp.

Kingston Technology Corp. KSM48R40BD4-64HA 64GB DDR5 RDIMM server RAM

SKU CH-0YWM-EM2CZ MPN KSM48R40BD4-64HA

A 64 GB DDR5 registered DIMM with ECC, CL40 latency and 4800 MHz speed for server motherboards

  • Total capacity64 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Memory timings40-39-39
  • Rated voltage1.1 V
  • Buffer typeRegistered

Capacity 64GB

Rank 2Rx4

Model Hynix, DRAM Lock

  • 64 GB capacity supports large server workloads
  • DDR5 4800 speed delivers high memory bandwidth
  • ECC protection detects and corrects data errors
  • Registered signal processing improves system stability
  • CL40 latency with 40-39-39 timing optimises response

Server DDR5 RDIMM with ECC

This 64 GB registered DDR5 module is built for servers and workstations that require error-correcting memory. It operates at 4800 MHz with a CAS latency of CL40 and a voltage of 1.10 V. The dual-rank 2Rx4 organisation helps maximise capacity per slot.

DDR5-4800 bandwidth ceiling

The PC5-38400 interface delivers 38400 MB/s of theoretical peak bandwidth per module. Real-world throughput is limited by the memory controller and the number of populated channels. Mixing speeds will force all modules to run at the lowest common rate.

64 GB single-module capacity

A single 288-pin RDIMM provides 64 GB, allowing high total memory without filling every slot. This suits configurations that need maximum density per channel. Systems that only accept unbuffered UDIMMs or lower-density modules cannot use this part.

How it compares

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

Price $1,927.99
Pricier than about 86% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $30.12 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 nameKSM48R40BD4-64HA
Total capacity64 GB
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
Memory timings40-39-39
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Size & build
Shipping weight0.09 kg
Package size165 × 51 × 8 mm

Other versions of this model

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Questions about this item

Should I choose a single 64GB module or multiple smaller modules for my server?

This is a single 64GB DDR5-4800 RDIMM with 2Rx4 organisation, ECC and registered signal processing. Using one module fills one slot; adding identical modules increases total capacity and enables multi-channel bandwidth.

What does the 4800 MHz speed deliver in a running system?

The module operates at DDR5-4800 with CL40-39-39 timings at 1.10V. Actual data rate depends on the memory controller and how many channels are populated.

How does the 288-pin DDR5 RDIMM interface limit performance?

The 288-pin DDR5 RDIMM form factor carries the DDR5-4800 signal with on-module register and ECC. Maximum throughput is set by the platform's memory controller and channel count.

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