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Fan header RPM fluctuations on Asus P8Z77-V LX

C

chelhxi

Senior member
Hi, on this recently built system on an Asus P8Z77-V LX board, I have 2 chassis fans and the cpu fan attached to the fan headers on the board itself. I can control and monitor them through Qfan, but heres the problem.

One of the chassis fans shows a spiking rpm in the bios every couple seconds. It goes from 800 rpm - 19000 rpm (ridiculous) and back. I have watched and listened to it, and it seems to be running very smoothly, so it's obviously a sensor issue. But could this cause problems? Is it possible the board is trying to feed extra voltage to the fan intermittently, or would this likely be just a sensor issue? I would hate for the fan header to burn out or something. (This computer is for someone else, so I can't keep a close eye on it once I give it to them)
The rpm's don't spike when I turn Qfan off and let the fan run full speed, but I need to throttle it.
 
That sounds like a sensor issue to me. Even if it wasn't, the mobo doesn't have the transformers necessary to step voltage up beyond the 12V input that it receives from the PSU.
 
Thanks for the response, but I ended up buying a couple new Gelid Silent 12's, and just running them full bore instead. It's quieter than the throttled stock corsair fans, and probably pushes more air. Good to hear no overvoltage could actually occur though.
 
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