Scythe NCU-2000 Fanless CPU Cooler

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SPCR's standard heatsink testing method of a Panaflo 80mm low speed fan is not applicable here. The design calls for no fan to be used. There's no facility to mount any fan, although it is easy to rig up.

Test platform

  • Intel P4-2.8A The Thermal Design Power (TDP) of this P4-2.8 (533 MHz bus) is 68.4 or 69.7W depending on the version. As the CPU is a sample without normal markings, it's not clear which version it is, so we'll round the number off to ~69W. The Maximum Power (MP), as calculated by CPUHeat & CPUMSR, is 79W.
  • Intel D845PEBT2 motherboard - Intel 845PE Chipset; on-die CPU thermal diode monitoring
  • nVidia GF400MX VGA card (AGP)
  • OCZ DDRAM PC-3700, 512 MB
  • Seagate Barracuda IV 40G 1-platter drive (in Smart Drive from Silicon Acoustics)
  • CoolMax Taurus CF-300 Fanless ATX PSU
  • Zalman Multi-Connector (ZM-MC1) and Fanmate1 voltage controller
  • Arctic Silver Ceramique Thermal Compound
  • Two-level plywood platform with foam damping feet. Motherboard on top; most other components below. Eases heatsink changes and setup.
  • CPUBurn processor stress software
  • Folding @ Home client software
  • Intel Active Monitor and Motherboard Monitor software to show CPU temperature

For the correct orientation of the fins on the Intel D845PEBT2 motherboard, the copper base had to be mounted the easy way, as shown below.

View from top edge of test motherboard. Arch of clip is the source of tension to keep HS tight against CPU.

When the clip is installed, the bolt simply fits into and pushes against the round niche at the top edge of the base.

Here it is, fully installed.

Before testing could be started, however, the motherboard had to be vertically positioned. This HS is designed to be used in tower case systems, remember? So, the entire test rig was carefully turned on its side as shown below. It is not quite perfectly vertical, but is close enough for our purposes.

Only precarious if jostled hard.


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