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Unusually high fan speed (CM Hyper212)

post #1 of 8
Thread Starter 
Hi all,

I have recently installed a Hyper 212+, and while my temps seem quite good (barely above ambient) my fan seems to be spinning faster than it should.

tBxVL.png

As you can see my idle temps are very low, however the cpu fan insists on spinning at 1450rpm!! I was told the fan on the hyper 212 should operate between 800-2000rpm, so it shouldn't be up near 1450rpm unless it was much hotter than this I would have thought.

My bios fan settings are to start at 25c and full at 55c.

All I can think of is that the fan is taking the reading from the motherboard TMPIN0 (34c) instead of the CPU.

Any help will be greatly appreciated, I will be upgrading to a 955BE tomorrow, so if there is any adjustment I can make I would like to do it before this gets installed.
post #2 of 8
go to bios
power tab -> hw monitor
enable qfan
start voltage = 4v
start temp = 35c
full temp = 51c

should slow it down some

mines goes from 950rpm-1800rpm
Edited by ffejrxx - 4/25/11 at 10:43pm
post #3 of 8
Thread Starter 
Quote:
Originally Posted by ffejrxx;13274568 
go to bios
power tab -> hw monitor
enable qfan
start voltage = 4v
start temp = 35c
full temp = 51c

should slow it down some

mines goes from 950rpm-1800rpm

This did the trick cheers! Can you tell me what difference changing the start voltage makes? By default mine was set to 5v.
post #4 of 8
its the voltage it gives the fan when its under the low temp
post #5 of 8
Thread Starter 
Hmm.. ok, so what difference would having it set to 4v compared to 5v have? Does this mean it would start at a lower rpm?
post #6 of 8
Quote:
Originally Posted by eggs2see;13274741 
Hmm.. ok, so what difference would having it set to 4v compared to 5v have? Does this mean it would start at a lower rpm?
Yes. Most computer case fans are designed to run at 12 V. So running at 4 V will make the fan spin slower.
post #7 of 8
Thread Starter 
Makes perfect sense. Thanks Riou & ffejrxx
post #8 of 8
yep, lower voltage will let the fan spin slower

as the temp rises it will raise the voltage
low temp -> high temp
min v -> 12v
low rpm -> max rpm
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