I tested the radiator by inserting it into my existing 10mm-tubing system, replacing my modified Senfu single-fan unit. The jacket used is the same one from my original Water Cooling Experiment from over a year ago now. The pump is a RIO 800 rated to nearly 600 litres/hour at 1ft height.

Highly professional test rig. Steak knife supporting the fan and radiator not included. :)

For testing, I used my current heat-monster CPU, a Celeron 400 overclocked to 600MHz at 2.3V on an Asus S370-133 slocket in an Asus P3V4X motherboard. When water-cooling, I use a 60mm fan to blow air over the north-bridge heatsink - normally there would be airflow over it from the CPU's heatsink/fan unit, but of course not when watercooling and I find it gets very hot. I also have a fan blowing onto a heatsink on the ICS clock-generator chip - check out our P3V4X forum for more info on this issue. I ran the machine for 2 hours with each setup, looping a 3DMark 2000 batch run. After two hours of this, the temperature was recorded from a remote thermal probe taped to the back of the slocket, behind the CPU core. For all three tests the ambient temperature was around 24.5C.

The cool-computers unit fares well, maintaining a lower temperature than the other two configurations. In fact, now that I've given the unit away as part of a recent competition, I can see I'm going to have to attack the Senfu unit again with the Dremel and see if I can further remove the restriction on the inlet and exhaust connectors to let the longer internal length come into play properly. All that aside, the Cool-Computers unit impressed me - great from a usage perspective, being easy to mount and fitting the more common (and more sensible) large tubing, and performing very well for it's size. If you're looking for a unit to tuck away inside your case and solve your cooling problems, this could well be it!