CPU temperature not increasing with decreased CPU fan speed

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JoexLegacy

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Nov 5, 2013
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I've installed SpeedFan cause my cpu fan was making anoying loud geiger counter noises on a constant basis. I set it up and decreased the speed and the sound is gone (Such a relief) but I've noticed on my CoreTemp readings the temperature is not affected at all on idle from 100% to 40% decrease in CPU fan speed (remains around 40). How is this possible?

CPU Is Intel i7-2600K @ 3.40GHz

Fan is I believe Hyper 212 EVO

Bonus question: Can I adjust a fan speed curve in speedfan so my cpu will get to 100% when temp reaches 70C?
 
Solution
geofelt
Your motherboard bios might be the first place to look into fan speed controls.
Likely, it was defaulting to max rpm.
That is normal at boot up time.
Personally, I like to have an efficient cooler that keeps temperatures under control while running fans at a constant speed.

I think what you want to do can be done either by speedfan or by the bios.

40c. at idle seems to me to be a bit high.
I expect to see 10-15c. over ambient if your cooler is mounted well and is getting enough fresh air to do it's job.
One cause can be the use of excess paste which acts as an insulator.
Temperatures always start from ambient and go up from there. A more efficient cooler will have a lower delta over ambient.
It would seem that at 100% or 40% fan...
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JamesSneed

JamesSneed

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Oct 26, 2009
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I would be happy with that :) You want to see it increase set the fan speed to say 20%.

It is likely cooling every so slightly better at 100% vs 40% fan speed. However there are some things that come in to play that are essentially bottlenecks to cooling. There is only so much efficiency each heatsink has in transferring heat from the CPU, to the fins of the heatsink. If at 40% you are able to dissipate said heat then adding more fan speed does not dissipate more heat, well not significantly more. You get to a point of diminishing returns on fan speed.
 
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geofelt

geofelt

Titan
Oct 9, 2006
54,295
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Your motherboard bios might be the first place to look into fan speed controls.
Likely, it was defaulting to max rpm.
That is normal at boot up time.
Personally, I like to have an efficient cooler that keeps temperatures under control while running fans at a constant speed.

I think what you want to do can be done either by speedfan or by the bios.

40c. at idle seems to me to be a bit high.
I expect to see 10-15c. over ambient if your cooler is mounted well and is getting enough fresh air to do it's job.
One cause can be the use of excess paste which acts as an insulator.
Temperatures always start from ambient and go up from there. A more efficient cooler will have a lower delta over ambient.
It would seem that at 100% or 40% fan speed, the cooler is doing all it can.


 
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