company ships the heatsink with the fan mounted in the exhaust position.
We tested the fan
like this, and also in the impingement position (air moving down into the
fins). The 7-bladed fan is made by Sunon and features ball bearings, ARC and MLC
technologies. It is powered from a 3-pin connector with RPM monitoring that plugs directly
into the motherboard.
cooler is really like no other we have ever
tested before. The 60-odd fins are grouped at the center and compress in such
a way that they form this 'flower' shape. The top of the heatsink is not
machined, nor does it need to be, and there is 2mm of space between the top
of the fins and the base of the fan.
Note the four holes used for mounting. Two align with socket A motherboards, and
two with Pentium 4 boards.
The heatsink is constructed from essentially three parts. The
flower heatsink, the fan shroud and frame, and the fan. The four brass stand-offs are what connect
to the motherboard (each is spring tensioned) and hold the CNPS5000-plus in place
tightly. 13mm of the total 42mm of copper fin is exposed at
The side shows more about
how this heatsink is assembled. Two screws hold the center FHS in place,
while the stainless steel bolts hold the FHS together. The brass stand-offs hold the
entire unit in tension, in place on the motherboard.
base of the heatsink is perfectly flat and smooth.
The useable area measures roughly 23x30mm. While it is not immediately evident, the fins are
stepped down from the surface of the base by 1mm.