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Four green DDR5 UDIMM sticks in anti-static tray

NEMIX RAM

NEMIX RAM 128GB (4x32GB) DDR5 4800 CL40 1.1V 2Rx8 UDIMM Dell Precision 3660 Tower memory upgrade

SKU CH-TW3N-S575B

128 GB DDR5 kit in four 32 GB unbuffered UDIMMs at 4800 MT/s CL40 1.10 V for Dell Precision 3660 Tower

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeUnbuffered
  • Rated voltage1.1 V

Capacity 128GB 4X32GB

  • 128GB total capacity from four 32GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • CL40 CAS latency at 1.1V operating voltage
  • 2Rx8 dual-rank organisation on 288-pin UDIMM form factor
  • Validated for Dell Precision 3660 Tower workstation compatibility

Dell Precision 3660 DDR5 upgrade kit

This 128GB kit contains four 32GB DDR5 4800 modules built for the Dell Precision 3660 Tower workstation. It targets professionals who need maximum supported memory capacity for heavy multitasking, virtualization or large dataset workloads.

Thermals and power profile

Each module runs at 1.1V without a heat spreader, relying on the workstation's chassis airflow for cooling. The low voltage and unbuffered design keep power draw modest and acoustic impact negligible during typical sustained loads.

What the kit changes

The matched 2Rx8 configuration populates all four slots with validated modules, removing mixed-rank instability risks. Rigorous stress testing under load is performed before shipment to ensure immediate compatibility and system stability.

How it compares

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

Price $1,840.99
Pricier than about 67% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $14.38 per GB
Pricier than about 61% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineDell Server/Workstation Compatible Series Memory
Model nameDell DDR5 4800 MHz Non-ECC Unbuffered UDIMM
Part numberMD38400-328K4
Total capacity128 GB (4 × 32 GB)
Product type288-Pin DDR5 UDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL40
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.1 V
Compatibility
Compatible systemsDell
In the box
Included items128 GB (4 × 32 GB) DDR5 4800 MHz PC5-38400 2Rx8 1.1 V CL40 288-PIN Non-ECC Unbuffered UDIMM KIT

Other versions of this model

3 more in the same range

Questions about this item

How do I install the four 288-pin DDR5 UDIMM modules in the Dell Precision 3660 Tower, and what step is often missed?

Power off and unplug the workstation, open the chassis, align each module's notch with the slot key, press firmly until both retention clips click, then verify all four 32 GB modules appear in BIOS before closing the case.

What maintenance or replacement will the 128 GB DDR5 4800 CL40 kit need over its service life?

The unbuffered non-ECC modules have no heat spreaders and no moving parts; keep interior dust clear and ensure airflow stays adequate — no scheduled replacement is required unless a module fails.

What limit appears first when the 2Rx8 DDR5 4800 memory runs sustained workloads at 1.1 V?

The CAS latency of CL40 at 4800 MT/s sets the timing boundary; sustained throughput is capped by that latency and the fixed 1.10 V operating voltage.

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