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Originally Posted by nicozeg
The real problem happens on traditional heatsinks. As air flows to the mainboard and has to turn to the sides, a lot of it is recirculated by the fan. On average intake readings were about 4°C higher than room! Even worst is that some areas of the fan draw more recirculating air, while others fresh room air, so small variations on Tc positioning have big impact on readings.
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Ever notice on OEM cases where the power supply intake is is right above the HS fan?
That's why it is there, to minimize recirculation. Good case flow is a common sense given.
Testing in open air will generally give you higher temps and without the exhaust air being drawn off you will tend to heat up local to cpu sockett components also.
Lacking a simulated die, I would place a 120/92 mm fan intake side 3-5 in. above the intake of the heat sink it will prevent recirculation to a great extent.
I would be careful not to get the added fan too close or run it at high rpms so the heat sink fan is not competing significantly with the added fan.
the effect is not as noticable with the delta Monster fan HS as they tend to dominate case flow all by themselves. smaller fans tend to show recirculation effects more
Could also do a fan cut out with a piece of card board extended 4-5 in. in a square or round flat plane. This would direct the air away from the HSF far enough not to be drawn back in and would not significantly effect HSF performance.