I've been having this problem with my CPU fan ever since I've build my computer and I can't seem to figure out what's wrong.
I'm using an after market cpu cooler and pwm fan (hyper evo 212). The CPU fan will start stable but overtime in a matter of maybe half a day to a day just ramp up all the way to max rpm. Sometimes, it will ramp up to max rpm, then die. Sometimes, the cpu fan will just die and not turn back on.
I've checked the bios and this happens regardless of what Smart fan mode its on (quiet/aggresive).
I've replaced the CPU fan with another pwm fan and still have the same problem.
I've replaced the CPU.
I've even replaced the motherboard with an identical one with the same problem.
I've tried using programs like speedfan to see if it'll work, but same problem.
When using HW monitor to monitor rpm / temperature, the cpu fan would actually disappear from HW monitor and then it would ramp up to full rpm.
The only thing I haven't replaced is the PSU but I dont know if this is the problem. The computer works fine its just that problem with the erratic cpu fan. Any help would be greatly appreciated.
AMD FX 6300
Hyper Evo 212
RipJaws 4gb 2x
Biostar Ta970 motherboard
R9 280 GPU
Corsair CX 500 W PSU
Edited by kevdit, 29 January 2015 - 05:18 AM.