Cooling fan temperature switch on cpu or heatsink?

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fefrie · #1 Post by **fefrie** » Sun May 13, 2007 11:54 pm

The reason I ask is that it seems my cpu runs at 55 at idle. Seems a bit high.

If the switch to turn on the cooling fan is 'determined' by the cpu, it would seem that the switch would turn on when the cpu deemed appropriate and temps would be nice and low.

I'm now starting to think that the 'turn on point' of the fan is determined by something within the heat sink itself. If there isn't sufficient thermal paste to transfer heat from the cpu to the heat sink then if the 'switch' is in the heat sink, insufficient heat transfer would cause the heat sink to be artificially low in comparison to the cpu. This would in turn cause a delay in the fan turning on.

Does anyone understand what I'm trying to get at? I'm confusing myself.

I guess I'll just reapply the thermal grease and find out what happens.

#2 Post by **RealBlackStuff** » Mon May 14, 2007 2:17 am

It's quite simple really. You MUST use thermal paste between CPU and cooler, properly applied.
Instructions: http://www.ocforums.com/showthread.php?t=361385

If there is too much or not enough, the thermal sensor in the CPU area does not work properly.
There is a dedicated forum for the Fan Control program, that can be used: Thinkpad Utility Work Area

fefrie · #3 Post by **fefrie** » Mon May 14, 2007 3:42 am

I guess that's what I was trying to figure out.

Are the temperature sensor and the fan control two seperate independant components?

If the cpu temp sensor is screaming 'Hot! Hot!' does it have the ability to turn on the fan control

Or

does it have to transfer heat to the heat sink where the heat sink says 'Hot! Hot!' and the heat sink turns on the fan control.

I'm just curious as to how the schematics work, but yes, I think that I will reapply some thermal paste to the cpu. I think a processor running at 60c at idle and web surfing is a little high

dsigma6 · #4 Post by **dsigma6** » Mon May 14, 2007 7:56 am

Use TPFancontrol!!

fefrie · #5 Post by **fefrie** » Tue May 15, 2007 1:15 am

is it the one at sourceforge.net? and it can be used on the t23 right?

#6 Post by **RealBlackStuff** » Tue May 15, 2007 1:46 am

If you found the link in Bill's post, yes.
And we would not have posted it here if it would not work on a T23.
On a T23 it does not have the full functionality though, so read that forum.

dsigma6 · #7 Post by **dsigma6** » Tue May 15, 2007 7:08 am

RealBlackStuff wrote:If you found the link in Bill's post, yes.
And we would not have posted it here if it would not work on a T23.
On a T23 it does not have the full functionality though, so read that forum.

What are you talkin' about? It reads the top 4 or 5 areas on the fan list, which most importantly is the CPU. The program can be made to turn the fan off, put it in bios mode, or set to any temp range you like.

It works just as good on my T23 as it did on my T43.

Cooling fan temperature switch on cpu or heatsink?

Cooling fan temperature switch on cpu or heatsink?

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