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A green circuit board with black memory chips and gold edge connectors

NEMIX RAM

NEMIX RAM 128GB DDR5 4800 CL40 1.1V 4Rx4 ECC RDIMM Cisco MR38400-744K1 memory upgrade

SKU CH-061T-EH1WW

128 GB DDR5 4800 registered ECC RDIMM with CL40 latency and 1.1 V operation for Cisco servers

  • Total capacity128 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 128 GB capacity scales memory-heavy server workloads
  • DDR5 4800 MT/s speed feeds data to multi-core CPUs
  • CL40 latency at 1.10 V balances throughput and power
  • ECC registered design detects and corrects single-bit errors
  • 288-pin 4Rx4 RDIMM fits Cisco UCS MR38400-744K1 slots

Cisco Server Memory Upgrade

This 128GB DDR5 RDIMM is built for Cisco UCS servers that require registered ECC memory. The single-module design adds high-density capacity in one slot, simplifying upgrades for IT teams managing dense virtualization or database workloads.

Sustained Load Behaviour

ECC and registered buffering protect data integrity during continuous operation, while the 4Rx4 organisation spreads accesses across four ranks to keep throughput steady under heavy multi-threaded demand. The module runs at 4800MHz with CL40 latency, delivering predictable bandwidth for long-running server tasks.

Thermals, Noise and Power

Operating at 1.1V, the module draws minimal power and generates little heat without a heat spreader. Passive cooling in a properly ventilated chassis keeps temperatures low, and the lack of moving parts means the upgrade adds no audible noise to the rack environment.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $3,564.99
Pricier than about 75% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $27.85 per GB
Pricier than about 78% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineCisco Server Compatible Series Memory
Model nameCisco DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-744K1
Total capacity128 GB
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsCisco
In the box
Included items128 GB (1 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

How much power does this 128GB DDR5 4800 CL40 registered module draw at its rated 1.1V voltage during continuous operation?

The module operates at 1.1V, the standard DDR5 voltage, so power draw scales with the 128GB capacity and 4800 MT/s data rate; exact watts depend on workload and server memory-controller tuning.

What server platform must I already own for this Cisco MR38400-744K1 288-pin RDIMM to be recognised and initialised?

It is validated for Cisco UCS servers that list the MR38400-744K1 part number; the platform must support DDR5 4800 registered ECC memory with 4Rx4 organisation.

Will this 4Rx4 DDR5 4800 CL40 RDIMM operate in the same Cisco UCS chassis alongside existing 2Rx4 or 1Rx4 DDR5 4800 modules?

Yes — Cisco UCS memory controllers support mixed-rank populations at the same speed; the system will run all slots at 4800 MT/s CL40 provided the total rank count per channel stays within the platform limit.

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