Low fan speed equals lower temps and high speed equals higher temps?

[gamefreakgcb]

My current setup. Now the back is a 120MM fan adapted with an 80->120MM adapter set to exhaust, the CPU fan is also puching towards exhaust, the PSU is also exhausting and has an additional 80MM in the back of the PSU. I have one more 120MM intake in the front and one 80MM top blowing out. Now I run all my fans off the mobo headers and all set to full speed (Q-Fan disabled). I have this nifty little remote that came with my mobo and one of the buttons on it is to make the system silent, once activated, my Yates drop from 1500RPM to sub-900 RPM and the top blowhole fan which is the loudest of the bunch also quiets down, my dilemma here? My temps are 36-37 idling at full fan speeds and they drop by 3-4 degrees if I activate that silence feature option (affects fans only and nothing else), and under load there can be a difference of as much as 6 degrees C :shocked:, I always used to think, the more air I push the better my temps, so now either there is something wrong with my logic or my setup 😛. I tried to use the back as intake but than my HSF has to be fanless since I dont have any fans that have those support beams on the fans (all my fans have it on one side and to put it onto the other side I need those beams on the other side as well since the fan rests completely on the HSF.

 

[VinDSL]

Only thing I can think of, off the top of my head, is maybe the intakes are overpowering the exhausts -- trapping warm air inside the case...

 

[bearxor]

That setup looks almost exactly what I might end up doing, except I would leave the fan off the Ninja.

The best I can think of is that with your huge 120mm to 80mm adapter that when the fan is running at higher power it's actually causing a backdraft of air that goes back in to the case rather than out of the case. My suggestion would be to try an 80mm fan at that location and see if it helps.

From what I have read, those huge adapters are good for pulling air in but not so good for trying to push air out.

EDIT: If that's your problem, you could try this: Try putting the fan on the outside of your case. If you have a grill on the back of your case you could dremel it out unless its a good one (like Antec's). By moving the fan to the outside of your case you turn it from a "push" fan in to a "pull" fan solving your problem, but possibly uglyifying the back of your case.