I never posted before, so this is kinda cool. However, I have read at least a thousand entries on here and some on other sites as well. Been a lurker i guess. Now I have something to say!!
754 3000+ chip with cool and quiet on
Zalman al/cu for the CPU (not the hugish new one, last years model)
1 Gig chip
Spinpoint 80, 160 Gig sata (samsung)
400W Seasonic Tornado (have to pop it open tonight to find version if its even on it)
AIWonder 9800 Pro with the blue, latest sandwich plate Zalman and a 5v 92mm zalman fan on it. (note that AIWonder and 256 pro have faster clocks on the ram than 9800 pro non-AIW, but I have sinks on them anyways)
Case: Coolermaster Cavalier, with the big blue dial on it that never worked.
Pabst 120 on the exhaust, at 5v.
the cpu fan is always on max low except when i play half-life2 and have the speakers on ten as i shoot people.
I told all of this in annoying detail to explain my system. Its a good system by most quiet standards, being very powerful for gaming yet not producing a lot of heat out the back.
Here are some things that are freaky. Initially I had the pabst at 12volts full, for like a few months, wasnt that loud actually, a really smooth fan!! (recommend it over nexus 120 fan, nexus is really a bad cfm mover for a higher end system)
Then, I hooked it up finally, with some nervousness to the zalman big blue controller, which is the ultimate fan controller in my opinion. I noticed that system temps at like 7~ volts were the same, so I dropped it down to 5volts for a few hours. My house is warm, about 76 degrees F. I noticed that my Tornado spun slower and slower the more I turned down the single Pabst in the back. I keep it on 5volts now all the time, my PSU spins up less now. BTW, as I am posting in the PSU forum, Seasonic tornado isnt really quiet unless your landlord shuts your heat off or your parents refuse to put the temperature in the house to something comfortable. it likes to whine up and down with the slightest push, more anoying than a slightly louder yet more even sound.
So, I basically think I have proven that more air sometimes means warmer temps
I only think that it works if you push more than pulling, something mentioned once as being more efficient, I know, but not mentioned as to what I found, that more air sucking out from next to the psu causes the psu to not be able to remove its own heat as well.