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Single green DDR5 RDIMM with black heat spreader and gold contacts

A-Tech

A-Tech 128GB DDR5 4800 ECC RDIMM Server Memory

SKU CH-9TMM-4GA79

128 GB DDR5 4800 ECC RDIMM module with CL40 latency and 1.1 V operation

  • Total capacity128 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetSamsung Chipset
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • 128 GB DDR5 capacity handles heavy server workloads
  • 4800 MHz speed delivers high memory bandwidth
  • ECC RDIMM registered design ensures data integrity
  • Samsung chipset compatibility simplifies drop-in replacement
  • 1 V DDR5 voltage reduces power draw

128GB DDR5 4800 ECC RDIMM Server Memory

This 128GB DDR5 4800 ECC RDIMM module is built for servers and workstations that require registered, error-correcting memory. It replaces Samsung M321RAGA0B20-CWK and M321RAGA0B20-CWKZJ parts in compatible platforms.

DDR5 4800 registered DIMM limits

The DDR5 4800 standard at PC5-38400 speed requires a motherboard and CPU that support registered ECC DIMMs at 1.10V. Systems limited to lower DDR5 speeds or unbuffered memory cannot use this module.

128GB 4Rx4 3DS capacity

The single-module 128GB density uses 4Rx4 3DS/TSV organisation with Samsung chipset. Platforms that do not support this rank structure or maximum capacity per slot will not recognise the full memory.

How it compares

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

Price $3,658.99
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 $28.59 per GB
Pricier than about 90% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameA-Tech
Product lineCompatible Replacement for Samsung
Model nameM321RAGA0B20-CWK, M321RAGA0B20-CWKZJ
Total capacity128 GB
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetSamsung Chipset
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank2S2Rx4 (4Rx4 EC8)
Power
Rated voltage1.1 V

Questions about this item

Should I choose the 128GB single module or add multiple modules for my server?

This is a single 128GB module. Add more identical modules to reach your platform's maximum capacity and populate channels evenly for best bandwidth.

What does the 4800MHz speed deliver in a real server workload?

DDR5 4800 (PC5-38400) provides high throughput for virtualization, databases and compute tasks, with ECC correcting single-bit errors to maintain data integrity.

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

The registered 288-pin DDR5 DIMM runs at 1.1V with CL40 latency; the memory controller and CPU determine the final operating speed and maximum supported capacity.

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