Can you explain me some features of my mobo?

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AbyssD

AbyssD

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Sep 21, 2014
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Hi guys, can you please explain me what is the fan spin up/down time and how to set it correctly for my fans?

My motherboard is the Asus maximus vii hero, the software im using to control the fans its the AI Suite

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13thmonkey
Heatsink 101: the CPU heats up the heat sink, which is a big lump of metal that takes a reasonable amount of energy to heat up, the fans blow air over the heat sink to cool it down. BUT the fans don't know the temp of the heat sink, only of the cpu. If the heat sink gets too hot then the less heat energy is transferred from the cpu to the heatsink and the CPU gets cooler slower and slower, until eventually it gets too hot.
So:
If you have a setting of 0 then a really short spike in temp (say 1s) would result in the fans desperately trying to follow that spike, up and down. In reality that spike will not heat up the heat sink so the fans are actually making no difference, just making a lot of noise.
If you have a setting of say 5 and...
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13thmonkey

13thmonkey

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Jan 10, 2006
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if you set those times very short then it will respond very quickly to changes in temp, this might mean that the fans keep changing speed, which can be more annoying that just being constant but faster than they need to be. If you set them too long then they take a long time to respond, and you can overheat or cool it more than necessary. No harm will be done, try it in the middle, if the changes in speed are annoying then bump them both up a bit.
 
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AbyssD

AbyssD

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Sep 21, 2014
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I see i got an idea how is working but can you explain a little further? For example if i tune up the fan spin up time from 0 to 25.sec what is the result quicker response or?

and from fan spin down time with the same numbers what is the result?
 
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13thmonkey

13thmonkey

Titan
Jan 10, 2006
24,798
350
75,790
Heatsink 101: the CPU heats up the heat sink, which is a big lump of metal that takes a reasonable amount of energy to heat up, the fans blow air over the heat sink to cool it down. BUT the fans don't know the temp of the heat sink, only of the cpu. If the heat sink gets too hot then the less heat energy is transferred from the cpu to the heatsink and the CPU gets cooler slower and slower, until eventually it gets too hot.
So:
If you have a setting of 0 then a really short spike in temp (say 1s) would result in the fans desperately trying to follow that spike, up and down. In reality that spike will not heat up the heat sink so the fans are actually making no difference, just making a lot of noise.
If you have a setting of say 5 and a 1s spike, then the fans might speed up a bit, but not much.
If you had a setting of say 100 then the fans would not change.

However
If you had a longer spike, say 20s, this would be enough to heat up the Heatsink, so the correct fan behaviour is to spin up and cooler the heat sink down. So a setting of 0 would do that.
A setting of 5s would slowly ramp up the fan speeds. and a setting of 100 would very very slowly ramp it up, possibly leading to the heat sink getting too hot.

Think of that setting as the time period over which it takes an average temp reading for the fans speeds to follow.

If you want to know more, research hysteresis.
 
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