how to make retail hsf fan on amd64 run faster...

[cubeless]

the retail fan has a temp sensor... i have low case temp so the fan slows down since it's drawing cool air... as the fan slows the cpu heats up...

if i turn the fan so it draws air from the hs it spools up to 4500 rpm and actually cools better than it does blowing onto the hs at low speed...

speedfan doesn't help... there's a bios setting for smart fan, but none o fthe values makes any difference...

how to make the fan run 4500 rpm all the time?

answer: short out the thermistor... fan maxes at 5500 rpm... use speedfan to bring down to 4500 and it's pretty quiet...

 

[swtethan]

4500 is a crazy rpm

 

[mechBgon]

If there's a thermistor peeping out from the fan's motor hub, you could nip it off with a diagonal cutter. If you're running at stock speeds then you should probably leave well enough alone, though... cooling is useful up to a point, but it doesn't sound like you have a problem with your cooling to start with.

 

[cubeless]

rpm is by the hsdm thing that comes with epox board... be interesting to see how long a retail fan lasts at it's highest speed... it's really pretty quiet at that speed...

heat on cpu is a prob, it runs up to 120f under full load, and i do oc... i just wanted to try to oc the stock hsf so i don't have to buy an xp90... i guess i could try shorting out the thermistor...

i had stuck a 60mm delta on it and at 12v it cools down to 114f under full load... but it's too noisy for the den... at 7v it's no better than the stock fan...

 

[CheesePoofs]

120f (48.89C) is not hot at all. Anything under 60C is OK, so thats pretty far into the safe temp zone.

 

[mdubrow]

So far as I know, there is no temperature guage on the stock AMD heat sink. Fan speed is controlled by the motherboard or 3rd party software (like Speedfan).

It sounds like your motherboard's fan control is enabled in BIOS. Simple solution: if you don't want your fan speed to vary, just disable it in BIOS.

 

[ironique]

Originally posted by: mdubrow
Simple solution: if you don't want your fan speed to vary, just disable it in BIOS.

I second that.

 

[cubeless]

sure looks like a little thermistor sticking out at the base of the winding on the fan... could be the mobo making the change, but playing with the fan option in bios didn't make any difference, so i doubt it... and speedfan turns it down from whatever rpm it's turining when i tried it, so methinks the fan is a smartie...

and it definitely spins up higher when it's pulling hot air off the hs than when it's pushing cold into it...

i'm gonna wire the thermistor leads together a little later today ands see what happens...

 

[bradley]

Is there any other program that is capable of throttling fan speed? I tried Speedfan on my mom's ECS RS480-M SKT939 motherboard, but it has no effect.

BTW, the ATI Radeon XPRESS 200 is one kickass chipset.

 

[cubeless]

turn the stock cooler into a monster...

i scratched the coating off the base of the thermistor and wrapped it with a strand of wire...

now the fan maxes at 5500 rpm... at about 4500 it keeps the 1.5v 3000 at 2.2ghz around 113f at full p95 load...

time to try some more volts into the chip!!!