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Green 288-pin DDR5 RDIMM module, black chips, no heat spreader

NEMIX RAM

NEMIX RAM 128GB DDR5 4800 CL40 4Rx4 ECC RDIMM THINKMATE RAX-XS4-21S4 memory upgrade

SKU CH-4QKY-FGYYP

128 GB DDR5-4800 ECC registered RDIMM, CL40 4Rx4 at 1.1 V for Thinkmate RAX-XS4-21S4 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 for heavy workloads
  • DDR5 4800 speed delivers high bandwidth for data-intensive applications
  • ECC registered design detects and corrects errors to protect data integrity
  • 1 V operation reduces power draw in dense rack environments
  • Validated for Thinkmate RAX-XS4-21S4 ensures plug-and-play compatibility

Compatible Server Upgrade

This 128GB DDR5 module is built for the THINKMATE RAX-XS4-21S4 rackmount server. It delivers registered ECC memory with a 4Rx4 organisation for data-integrity workloads. The single-stick design fills one 288-pin slot at the rated 4800 MT/s speed.

Replaces Slower Registered DIMMs

The jump is worth it when your current registered memory runs below 4800 MT/s or lacks ECC protection. Moving to this PC5-38400 part raises bandwidth and adds error correction for mission-critical services. Systems already at this speed and rank see no practical gain.

Simple Slot Installation

Installation follows the server manual: power down, open the chassis, align the keyed 288-pin edge and press until the latches click. Common issues include mixing ranks or speeds across channels, which prevents POST. Verify the firmware supports 4Rx4 density before adding the module.

How it compares

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

Price $4,002.99
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 $31.27 per GB
Pricier than about 90% 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 numberMR38400-744K1
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 systemsTHINKMATE
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

Will the 288-pin DDR5 RDIMM fit the Thinkmate RAX-XS4-21S4 server memory slots?

Yes, the 288-pin DDR5 RDIMM form factor matches the Thinkmate RAX-XS4-21S4 server DIMM slots for direct installation.

Do I need to follow a specific slot population order when installing this 4Rx4 registered ECC module?

Install the 4Rx4 registered ECC module in the slot sequence defined in the Thinkmate RAX-XS4-21S4 manual; skipping the prescribed order is the common error that prevents boot.

How do I know when this 1.1 V DDR5 ECC module should be replaced?

Replace the module if the server logs uncorrectable ECC errors, fails memory diagnostics, or becomes unstable under sustained load at 1.1 V operation.

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