I just instaleld a new vid card and power supply, and now my fans are blowing very hard and very very loud. My old power supply was an antec 330w truepower, and the new power suplpy is a 600w coolermaster green power. One thing I noticed is the old power supply had a 2 line (blue and black) wire leading to a plug on my mobo labeled case_fan. My new power supply does not have this pair of cables. Is this a variable speed thermostat control or something that would regulate fan speed? If this is the case, then why didnt my fans ever get this loud when I was running it at full load?
Or is it a simple matter of more power getting to these fans? Though I would think the power runnign through those cables would be regulated to give the same output..
What ever the reason, my office now sounds like a wind tunnel =P.
I am running a P4 2.53 on a Asus P4P800 SE Mobo with 2gig of corsair 3200 xms mem. Radeon x850 pro vid, soundblaster Audigy2 zs platinum, in a antec case with 4 80mm antec case fans. Currently not overclocked with stock cooling on cpu.
This is the Power Supply in Question: Coolermaster RS-600-ASAA iGreen Power 600W
I used to have an Antec power supply with the same blue and black cable.
The PSU also had a couple of molex connecters which were labeled "fan only".
What happens as far as I can see it, is that when you have the blue n black cable connected to your motherboard and fans connected to the fan only molexs, the PSU controls the speed of the case fans, so presumably this is the reason why your fans run faster with the new PSU.
Thats what I believe, that 2 pin connector is most likely to control fan power from molex and probably the PSU's fan also. Now that you disconnected it, your mobo (if your using 3 pin headers for fans) or PSU is supplying full voltage to every fan in your case even if its not needed.