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HD4850 fan wiring question

post #1 of 12
Thread Starter 
I want to pull a couple wires out of the fan header to make it run at 100%

Does anyone know which ones to pull? I don't know crap about fan wiring

But this card just CANT run this hot anymore!
post #2 of 12
if there's red+black+another color, pull the other color..

but be careful! if you pull the wrong color, a bomb goes off and millions of innocent civilians die

Seriously though, red is positive, black is negative, and the other color is the control wire

P.S: I'm guessing that 80-90C is accurate?
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post #3 of 12
Thread Starter 
LOL 80c idle!!!

There are actually 4 wires red, blue, black and yellow
post #4 of 12
Quote:
Originally Posted by PR1M3R View Post
LOL 80c idle!!!

There are actually 4 wires red, blue, black and yellow
It's PWM. Black=ground, Red=12v, Blue=PWM control, Yellow=RPM.
Be careful, sometimes vendors cross the Blue and Yellow so you can't mess with the fan.
post #5 of 12
Thread Starter 
If I try the yellow and blue 1 at a time it won't hurt anything will it?
post #6 of 12
it shouldnt you can just reconnect them
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post #7 of 12
what you can do as to not risk voiding the warranty is unplug the fan from the card, and plug clip a piece of wire from the corresponding red& block prongs on the card, into the pwm connector on the fan.

For one, you'll find out exactly which wire is right (and IIRC, gymenii is correct),
and for two, you aren't destroying anything and can quickly put it back together if need be =)
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post #8 of 12
The PWM circuit doesn't work like that, sorry to say. The thermistor tells the fan circuit how much power to send to the fan based on last temp reading. If it is not being used then the fan will run at whatever the last sensor "read" was. If you want the fan to run 100% use a fan header on your M/B or plug into a fan controller.
post #9 of 12
Quote:
Originally Posted by PR1M3R View Post
I want to pull a couple wires out of the fan header to make it run at 100%

Does anyone know which ones to pull? I don't know crap about fan wiring

But this card just CANT run this hot anymore!
On the 4850 it is the Blue wire Watch the noise though apparently it is really noisy at 100%

http://www.vr-zone.com/articles/RV77...ng/5901-5.html
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post #10 of 12
Thread Starter 
Just pulled the fan header out, lifted the little white plastic tab and pulled the blue wire out. No damage and instantly reversible. Fan now runs at 100% (pretty damn loud) but dropped 40c off my idle temps!!!
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