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
Four green DDR5 RDIMM modules in anti-static tray

NEMIX RAM

NEMIX RAM 256GB (4x64GB) DDR5 4800 CL40 1.1V ECC RDIMM memory upgrade

SKU CH-YZ98-TQA23

256 GB DDR5 registered ECC server memory kit with four 64 GB modules running at 4800 MT/s, CL40 and 1.10 V for Supermicro FatTwin SuperServer systems

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB total capacity across four 64 GB modules
  • DDR5 4800 MT/s speed rated at PC5-38400
  • ECC registered RDIMM for data integrity in servers
  • Low 1.10 V operating voltage reduces power draw
  • Validated for Supermicro FatTwin SYS-F521E3-RTB and SYS-F511E2-RT systems

Capacity and purpose

This 256GB kit contains four 64GB DDR5 4800 CL40 registered ECC RDIMMs built for Supermicro FatTwin and SuperServer systems including the SYS-F521E3-RTB, SYS-F511E2-RT and X13SEFR-A. It targets IT teams expanding memory in validated server platforms where error correction and registered signalling are required.

What the kit changes

Four matched modules populate four slots at once, delivering the full 256GB capacity with consistent 1.1V operation and CL40 timing across every rank. The 2Rx4 organisation and PC5-38400 rating keep bandwidth stable under sustained workloads, while on-board ECC corrects single-bit errors without software overhead.

Installation notes

Each 288-pin RDIMM seats in the standard DDR5 server slot; the key notch prevents misalignment and no heat spreader interferes with tight DIMM spacing. Systems that require specific population rules or BIOS revision updates for 64GB densities may need a firmware check before all four modules are recognised.

How it compares

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

Price $6,896.99
Pricier than about 83% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $26.94 per GB
Pricier than about 75% 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 lineSuperMicro Server/Workstation Compatible Series Memory
Model nameSuperMicro DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-924K4
Total capacity256 GB (4 × 64 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 rank2Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro
In the box
Included items256 GB (4 × 64 GB) DDR5 4800 MHz PC5-38400 2Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Will the four 64 GB modules need any firmware updates or reseating over time?

No firmware is involved; the modules are standard 288-pin DDR5 RDIMMs that stay seated unless the chassis is moved.

What is the first limit reached when the kit runs at full 4800 MT/s continuously?

The CL40 latency at 1.10 V sets the timing boundary before thermal or power limits appear.

How much heat and noise does the 256 GB kit produce during all-day operation?

With no heat spreaders and a low 1.10 V operating voltage, the modules add minimal heat and make no audible noise.

More in Model-Specific Memory Upgrades

Similar items