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Green rectangular DDR5 RDIMM module 128GB 288-pin no heat spreader

NEMIX RAM

NEMIX RAM 128GB DDR5 4800 CL40 4Rx4 1.1V ECC RDIMM SuperMicro 221HE memory upgrade

SKU CH-QDJZ-W8K7J

A 128GB DDR5 4800 CL40 4Rx4 1.1V ECC RDIMM built for SuperMicro 221HE servers

  • Total capacity128 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 128 GB single module doubles server capacity instantly
  • DDR5 4800 CL40 registered ECC keeps data accurate under load
  • 1 V operation lowers power draw in dense chassis
  • 4Rx4 288-pin RDIMM fits SuperMicro 221HE SuperServer bays
  • Samsung Micron Hynix chipset ensures enterprise-grade reliability

Compatible SuperMicro 221HE Server Memory

This 128GB DDR5 module is built for the SuperMicro IOT SuperServer SYS-221HE series. It delivers registered ECC reliability for mission-critical workloads in compatible enterprise systems.

DDR5 4800 Registered ECC Limits

The DDR5 4800 standard sets the electrical and timing boundaries for this registered DIMM. System memory controllers and BIOS revisions determine the actual operating speed and supported population rules.

128GB 4Rx4 Single-Module Density

A single 128GB 4Rx4 rank structure provides high capacity per slot. Buyers needing lower density per DIMM or non-registered memory should verify platform requirements before ordering.

How it compares

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

Price $4,034.99
Pricier than about 77% 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 $31.52 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 lineSuperMicro Server/Workstation Compatible Series Memory
Model nameSuperMicro 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 systemsSupermicro
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

Should I pick the 128GB single module or combine smaller sticks to reach the same total?

This kit is a single 128GB DDR5 RDIMM running at 4800 with CL40 timing. Using one module fills one 288‑pin slot and leaves remaining channels open for future expansion.

What does the 4800 speed rating deliver inside a SuperMicro SYS‑221HE server?

The module operates at DDR5 4800 (PC5‑38400) with a CAS latency of 40 at 1.10V. In the SYS‑221HE it will run at the platform's supported JEDEC rate, providing registered ECC bandwidth for multi‑core workloads.

How does the 288‑pin DDR5 RDIMM interface limit performance in this system?

The 288‑pin registered DDR5 interface caps the module at the 4800 MT/s JEDEC standard. The SYS‑221HE memory controller drives it at that speed with 4Rx4 organisation and on‑die ECC, so no higher data rate is possible without a platform change.

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