Heatsink Test – Joe

SUMMARY: Big, low noise and decent cooling.


Size: 126 x 77 mm; 60 fins; Heat Column 33 x 150 mm

The good guys at Thermal Transtech were nice enough to send a sample of their nPowerTEK NPH Big heatsink to test out. This is a bit different from other heatpipes in that the heatpipe is one large column:


Pic courtesy of nPowerTEK

The heat column runs through the fins, cooled by a 120 mm fan.

The base appears adequately flat; I used the Poor Man’s Flatness Test and it looks like there might be some high spots on it:



Parts that ship with the unit for Intel 775 mounting:


The Test

The NPH Big was tested on an Asus P5WD2 motherboard P4 Motherboard Test Platform with a modified Pentium D 805 to read CPU case temps (both supplied by Directron). The NPH Big was tested with the fan that is included.


Case Temp

Ambient Temp


On-Die Temp¹

NPH Big, 1659 rpm, <50 dBA²





¹MBM on-die temperatures.
²50 dBA measured 8″ from the fan intake corresponds to about 30 dBA measured 3 feet from the fan, a very quiet noise level.

Results place the NPH Big in mid-rank of heatsinks tested to date (Heatsink Ranking).


The nPowerTEK NPH Big does a very nice cooling job and the included fan is quiet – a nice package for decent cooling at low noise.

Thanks again to Thermal Transtech for sending this our way to try out.

Disclosure: Joe Citarella has a financial interest in a company developing thermosyphon products for electronic chip cooling.

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