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Two green DDR5 RDIMM modules, bare circuit boards with black chips, 288 pins each

NEMIX RAM

NEMIX RAM THINKMATE DDR5 4800 ECC RDIMM 256GB (2x128GB) CL40 1.1V 288-Pin 4Rx4 memory upgrade

SKU CH-J05X-F43FN

A 256 GB DDR5 ECC RDIMM kit running at 4800 MT/s with CL40 latency and 1.1 V operation for ThinkMate rackmount servers

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB total capacity from two 128 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • ECC registered design protects data integrity in servers
  • Low 1.10 V operation reduces power draw per module
  • Validated for ThinkMate RAX-XS4-21S4 rackmount compatibility

ThinkMate DDR5 4800 ECC RDIMM 256GB Kit

This registered DDR5 memory kit provides 256GB across two 128GB modules for ThinkMate RAX-XS4-21S4 rackmount servers. It operates at 4800MHz with CL40 latency and 1.10V voltage. ECC and registered buffering protect data integrity in mission-critical workloads. The dual-rank 4Rx4 organisation uses major OEM Samsung, Micron or Hynix chips.

Suited for ThinkMate servers requiring registered

The kit fits administrators expanding capacity in the validated RAX-XS4-21S4 platform where registered DIMMs are mandatory. Builders needing unbuffered UDIMMs, non-ECC modules or speeds above 4800MHz should look elsewhere. Systems limited to lower densities than 128GB per slot cannot use these modules. Laptop, desktop or consumer motherboards are not supported.

Registered ECC with 4Rx4 organisation decides

The registered buffer and on-die ECC require a server chipset that explicitly supports RDIMM signalling. The 4Rx4 rank structure demands memory-controller support for quad-rank addressing. Without both features in the host firmware the modules will not initialise. Verify the ThinkMate service manual before purchase.

How it compares

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

Price $7,244.99
Pricier than about 83% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $28.30 per GB
Pricier than about 80% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineTHINKMATE Server/Workstation Compatible Series Memory
Model nameTHINKMATE DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-744K2
Total capacity256 GB (2 × 128 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 systemsTHINKMATE
In the box
Included items256 GB (2 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

What is included in the box and is anything else needed to install it?

The kit contains two 128GB DDR5 4800 registered ECC RDIMM modules, giving 256GB total; no extra parts are required for installation in a compatible Thinkmate RAX-XS4-21S4 server.

Which capacity or rank option should I choose for this Thinkmate server?

This specific kit provides 256GB in a 2x128GB 4Rx4 configuration, matching the part number MR38400-744K2 for the Thinkmate RAX-XS4-21S4.

What does the DDR5 4800 CL40 1.1V rating mean once the memory is installed?

The modules operate at 4800 MT/s with CAS latency 40 at 1.1V, delivering registered ECC DDR5 performance for the qualified Thinkmate platform.

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