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Green 288-pin DDR5 RDIMM module with black chips

SAMSUNG

SAMSUNG M321R2GA3EB2-CCP 16GB DDR5-6400 RDIMM server RAM

SKU CH-0GHW-HKWNN MPN M321R2GA3EB2-CCP

Provides 16 GB of DDR5-6400 registered ECC memory in a single-rank 288-pin DIMM for server workloads

  • Total capacity16 GB
  • Rated speedDDR5 6400 (PC5 51200)
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rankSingle-rank
  • Product type288-Pin DDR5 RDIMM
  • 16 GB capacity for demanding server workloads
  • DDR5-6400 speed delivers 51200 MT/s data rates
  • Registered DIMM design improves signal integrity
  • Single-rank layout enables higher density configurations
  • 10 V operation reduces power consumption per module

16 GB DDR5-6400 RDIMM

This Samsung module is a 16 GB registered DDR5 DIMM designed for server platforms. It operates at 6400 MHz with a 1.10 V voltage and uses a 288-pin form factor. Single-rank organization helps keep latency low in multi-DIMM configurations.

Suits registered-memory servers.

The registered signal processing requires a motherboard that supports RDIMM topology, making it suitable for enterprise servers and workstations. Builders using consumer desktop boards that accept only unbuffered UDIMMs cannot install this module. Buyers needing higher capacity per slot should look at larger-density RDIMMs.

Single-rank 16 GB at 6400 MHz

The single-rank 16 GB density at DDR5-6400 is the specification that determines fit: it delivers one rank per channel at the rated speed. Systems populated with multiple single-rank modules can maintain the 6400 MT/s data rate more easily than dual-rank alternatives. Verify your platform's qualified-vendor list for this exact part number before purchase.

How it compares

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

Price $1,348.99
Pricier than about 83% of the 6,523 comparable items (median $188.99).
Total capacity 16 GB
Lower than about 60% of the 6,064 comparable items (median 32 GB).
Price per GB $84.31 per GB
Pricier than about 90% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameSAMSUNG
Model nameM321R2GA3EB2-CCP
Total capacity16 GB
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Memory
Buffer typeRegistered
Memory rankSingle-rank
Power
Rated voltage1.1 V
Size & build
Shipping weight0.45 kg
Package size178 × 102 × 51 mm

Questions about this item

How does the 1.10 V operating voltage affect sustained throughput under heavy server workloads?

The 1.10 V DDR5 design reduces power draw per bit compared with earlier generations, helping maintain stable 6400 MT/s transfer rates during continuous operation without exceeding thermal limits.

What acoustic and thermal impact does the registered 288-pin module have when running all day?

As a passive component with no moving parts, the RDIMM adds no audible noise; its 1.10 V operation keeps heat output low, so standard server airflow handles cooling without extra fan speed.

Which existing server hardware is required for this DDR5 RDIMM to function?

A motherboard with 288-pin DDR5 RDIMM slots and a memory controller that supports 6400 MT/s registered ECC memory is required for the module to operate.

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