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Old 12th February 2006, 16:58   #1
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Recommended Heatsinks from Silent PC Review

CPU heatsinks are usually packaged and marketed with a fan, which explains the rise of the moniker HSF, heatsink fan. Most hardware web sites test the HSF as an integrated unit. For SPCR, this is not an ideal way to do things, mainly because almost all fans supplied with HS are too loud. If we had to test and use them in stock form, we would recommend less than 1% of all the HSF on the market.
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Old 12th February 2006, 17:01   #2
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Needless to say the lower the voltage to the fan, the lower the RPM and lower the CFM = lower the noise level, in an orderly manner.

Yes, no fan = no noise (from nothing)
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Old 12th February 2006, 17:08   #3
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not much to add here, only that AC freezer series deserves a higher ranking;
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Old 12th February 2006, 17:18   #4
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I do ......

Quote:
Motherboard makers generally assume a certain level of "spillover" airflow from the heatsink fan across the voltage regulator module (VRM) components that are placed around the CPU socket. These components include capacitors, power transistors and inductors (coils). When the CPU fan speed is reduced to minimal levels in order to achieve low noise, cooling for the CPU may be perfectly adequate with a good heatsink, but the VRM components may be prone to overheating, which can impair electrical efficiency and reduce component life.

Tall tower (or high rise) heatsinks with fans that blow air parallel to the motherboard rather than down at it are more likely to cause VRM component cooling problems even when the fan is not run at minimal speed, bcause the airflow is sometimes blocked by the fins from reaching the sufrace of the motherboard. When the fans on such heatsinks are slowed to minimum speed, VRM cooling can suffer quite a bit.

Users should be aware of this potential issue and ensure some additional airflow from at least one case exhaust fan in most systems. The quality, efficiency and intrinsic cooling of VRMs varies substantially from motherboard to motherboard, however.
After consideration of this fine print, there is more than one angle where the "best" is not enough. (robbing Peter to pay Paul)
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Old 12th February 2006, 17:33   #5
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Quote:
Tall tower (or high rise) heatsinks with fans that blow air parallel to the motherboard rather than down at it are more likely to cause VRM component cooling problems even when the fan is not run at minimal speed, bcause the airflow is sometimes blocked by the fins from reaching the sufrace of the motherboard. When the fans on such heatsinks are slowed to minimum speed, VRM cooling can suffer quite a bit.

how about some TECH data to back up that statement. In a case with 120mm rear exhaust I can tell you that Ninja gives better PWM temps than SI-120 when both use the same 120mm fan.

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Old 12th February 2006, 17:46   #6
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Originally posted by jmke
not much to add here, only that AC freezer series deserves a higher ranking;
I think price wasn't a factor in this rating but even then I doubt the Zalman offerings should be rated higher than the Freezers, simply because fan quality matters.
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