3 pin fan connectors Vs 4 pinc PSU connectors

[Bigjakkstaffa]

somehow, i recently got the impression that 2 identical 80mm Collermaster case fans, were belting out different volumes of air. i noticed the one on the three pin motherboard power connecter "felt" as though it was puting put more, wheras one that was attached to a 4pin PSu (via an adaptor) seemed to be giving less...am i correct in thinking 3 pins give better fan power...or am i just going loco:confused:

Cheers!,

[Bovon]

The only difference between the 3 pin fan, and the 2? wire fan that connects to a molex output from the psu is, the 3 pin fan conncector may have 3 wires, one of which is for RPM sensing or thermal control. Only 12 volts are needed to run a fan, which requires 2 wires. This can be from a connector on the mainboard or from a molex connector direct from the psu. The one that you have connected to a mainboard header that seems to not be 'belting' out as much air could be due to that fan may be different in speed than the other, or perhaps the mainboard header does not apply 12 volts. That could be a thermal type header that needs some electronic input to regulate the voltage. You say that the two Coolermaster fans are identical, if so, then they should run at the same RPM and produce the same amount of air movement.

[Bigjakkstaffa]

Thanks bovon...like i said -- I'm goin' Loco :)...well tahts put my (dysfunctional)mind at rest anyways -- thanks :)