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Air Flow Restriction

Testing methodology

A Noiseblocker-eLoop B12-P was mounted in “push” and an Extech 45158 thermo anemometer was placed 6″ away from the rad/fan assembly and in the same spot each time to eliminate the effect of deadspots or variation in the X/Y axes.

Results and discussion

Well that was not a real surprise, was it? All those added coolant tubes and fin stacks meant that air flow restriction was always going to be high and it ended up being the highest of the lot measured so far. I do not have a GTX 480 here, although I do have a GTX 560 so look out for a direct successor comparison in the upcoming review of the Nemesis GTR 560 soon.

But this does offer something new- let’s compare quad 120 mm radiators with fin density at or near 16 FPI only shall we?

This is why I keep saying do not look at FPI alone as a measure of airflow restriction- core thickness is another usual consideration, but now we have to consider also fin height along with fin and tube thickness, number of fin stacks and tubes, how big a plenum is built into the radiator and so on. On to thermal performance now on the next page!


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