We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green printed circuit board with black memory chips and gold edge contacts

NEMIX RAM

NEMIX RAM 128GB DDR5 4800 CL40 4Rx4 1.1V ECC RDIMM Dell XE8640 memory upgrade

SKU CH-FCZE-3B7QK

A 128 GB DDR5 4800 CL40 4Rx4 1.1 V ECC registered DIMM built for Dell PowerEdge XE8640 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 expands server memory headroom
  • DDR5 4800 speed delivers high bandwidth for demanding workloads
  • ECC registered design protects data integrity in mission-critical tasks
  • 1 V operation reduces power draw per module
  • Validated for Dell PowerEdge XE8640 rack server compatibility

Dell PowerEdge XE8640 upgrade module

This 128GB DDR5 registered DIMM is built for the Dell PowerEdge XE8640 rack server. It delivers ECC protection and a 4Rx4 organisation in a single 288-pin module. The part targets administrators who need maximum capacity per slot without mixing ranks.

Fits XE8640 memory architecture

The module operates at 1.1V and plugs directly into the server's DDR5 RDIMM slots. Registered signalling reduces electrical load on the memory controller, freeing headroom for additional modules. No heat spreader is fitted, so airflow follows the chassis design.

Sustained load behaviour

Rated at 4800 MT/s with CL40 latency, the DIMM maintains throughput during extended compute runs. ECC corrects single-bit errors on the fly, preventing silent data corruption. Major OEM DRAM from Samsung, Micron or Hynix underpins consistent timing under thermal pressure.

How it compares

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

Price $3,925.99
Pricier than about 76% 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 $30.67 per GB
Pricier than about 88% of the 20,941 comparable items (median $8.19 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 nameNEMIX RAM
Product lineDell Server/Workstation Compatible Series Memory
Model nameDell 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 systemsDell
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

What is the CAS latency that governs timing stability during sustained workloads?

The module runs at CL40, which is the CAS latency specified for this DDR5 4800 ECC RDIMM.

How much heat and power does a single 128 GB 4Rx4 stick draw when the server runs continuously?

It operates at 1.1 V with no heat spreader, so thermal output and power draw stay at the baseline for a registered DDR5 4800 module.

Which Dell server must already be in the rack for this RDIMM to work?

The memory is validated for the Dell PowerEdge XE8640 rack server.

More in Model-Specific Memory Upgrades

Similar items