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Green DDR5 RDIMM circuit board with 262 gold pins and black Samsung memory chips

A-Tech

A-Tech 256GB DDR5 4800 ECC RDIMM Samsung M321RBGA0B40-CWK Server Memory

SKU CH-7AKS-PZ85F

256 GB DDR5 4800 ECC registered DIMM with CL40 latency and 1.1 V operation

  • Total capacity256 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetSamsung Chipset
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • 256 GB capacity supports heavy virtualization workloads
  • DDR5 4800 speed delivers high memory bandwidth
  • ECC RDIMM protects data integrity in servers
  • 1 V operation reduces power consumption
  • 288-pin DIMM fits standard DDR5 server slots

High-Capacity DDR5 Server Memory

This is a 256GB DDR5 ECC registered DIMM built for server and workstation platforms. It operates at 4800MHz with a CAS latency of 40 and runs at the standard 1.10V. The module uses a Samsung chipset and a 288-pin form factor for high-density memory expansion.

Suited For High-Density Registered Slots

It fits systems that require registered ECC DDR5 modules with an 8Rx4 3DS/TSV rank configuration. Builders using unbuffered memory, non-ECC platforms, or motherboards limited to lower capacities per slot cannot use this module.

Key Spec Is 256GB Registered ECC DDR5

The single deciding factor is whether your platform supports a 256GB DDR5 4800 registered ECC DIMM with a 2S4Rx4 (8Rx4 EC8) organisation. Verify the qualified vendor list and maximum rank support before purchasing.

How it compares

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

Price $6,592.99
Pricier than about 91% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $25.75 per GB
Pricier than about 87% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameA-Tech
Product lineCompatible Replacement for Samsung
Model nameM321RBGA0B40-CWK, M321RBGA0B40-CWKZH
Total capacity256 GB
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetSamsung Chipset
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank2S4Rx4 (8Rx4 EC8)
Power
Rated voltage1.1 V

Questions about this item

Will the 288-pin DDR5 RDIMM fit my server's DIMM slots?

This module uses the standard 288-pin DDR5 DIMM form factor. Verify your motherboard supports DDR5 RDIMMs before installing.

How do I install this 256GB ECC RDIMM correctly?

Power down the server, open the chassis, align the module notch with the slot key, press firmly until the retention clips click. A common error is not seating both ends evenly.

When should I replace this 256GB DDR5 4800 module?

Replace if memory diagnostics report uncorrectable ECC errors, the system fails to POST with the module installed, or capacity no longer meets workload demands.

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