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timeless

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lm having an issue with system cooling. long story short my CPU fan seems to drop occasionally in speed to 500rpm, lve never been able to get it to go full for some reason. and occasionally when lve booted its taken powering down once to get the fan to start moving.

lve read about changing the setting from passive to active to get the CPU fan to go on full (which ld prefer) but the only fan settings l can see in my bios relate to Q-fan and cool'n'quiet settings, lve been through every other page but cant seem to find anything about changing to active rather than passive cooling.

my motherboard is an ASUS M5A78LM-LX and my cooler is a Arctic cooling freezer 7 pro rev 2, l havent updated the bios as lve never been happy doing such changes.
 
lve had issues with speedfan before. l tend to dislike messing with the program. l think my main issue with the cpu fan is "pwm" but l just cant find the setting to just make my fan go full whack as the only fan settings lve seen relate to cool'n'quiet and q-fan.
 
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I've had similar issues with fan speed in the past and these days I usually adopt the approach of 1) buying a quiet.. but large fan/heatsink that can shift a lot of air and 2) completely disabling any dynamic fan speed controls in the BIOS / UEFI. So the fan always just runs at full speed but I can hardly hear it in the first place.
 
essentially thats what l have, my heatsink is pretty chunky tho the fan l believe is only a 90mm, however the issue l believe is the PWM, its something to do with power management and its ability to be controlled. and lve asked around and from what l can tell the only fan settings l really do have are q-fan and cool'n'quiet, and the only real speed options l get from turning q-fan on are settings that make no real difference in RPMs even the turbo setting.

that said when cold booting with q-fan turned on l have to power down once before the fan will actually spin. and it seems to be common on fans with pwm ability.
 
I seem to remember the Asus fan controller didnt used to like really low speed fans; so I would disable Q fan and cool 'n quiet and see what happens.
 
pretty much whats happening now. l have both disabled but my fan isnt at its usual speed. while l dislike the idea of what lm contemplating lm thinking about locating my molex to 3pin converter and putting it onto a molex connection since it wont try to use the PWM ability so theoretically should just push the fan to full speed rather than it try to modulate the speed.
 
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Make sure you're on the latest BIOS version too, a reset of the defaults after updating might help if any of the settings data is corrupt. Also if you've installed any of those software utilities for controlling Mobo stuff then remove them too as they can sometimes override soft bios settings.

I suppose it could be a fault with the fan itself but that seems unlikely as their circuits are usually very simple.
 
fan went haywire after l played with q-fan in more depth.. tho l gained an extra 100 or so rpm out of the play around.

while l did grab an adapter for a 3 to 4pin adapter to remove the pwm wire which handles the power modulation l had this thought, the freezer pro 7 rev2 fan is essentially just a Arctic F9 Pro 92mm case fan without the base, and since it uses the same kind of setup with the so called vibration absorption system, theoretically l could just remove the base then remove the fan from the clips on my heatsink and just swap the fan on it and to save the pwm annoyance l can just get the 3pin version and plug it in as a 3pin cpu fan which just spins at full rpm.

http://www.arctic.ac/us_en/spare-fan-freezer-7-pro-rev-2-freezer-7-pro-freezer-64-pro.html - replacement fan
http://www.ebuyer.com/546793-arctic-f9-pro-92mm-case-fan-afaco-09p00-gba01 - case fan that looks compatible
 
Just fitted the f9 fan I linked 3pin version) and it works and runs at 2200 rpm straight from cold boot, much better without pwm.
 
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