GPU Fan to motherboard

[MrTJHunter94]

Hello again!
The fan controller has burnt out on my HD7870Le Powercolor GPU.
I have it straight wired into a molex plug but its spinning 100% speed, 100% of the time, is there a way I can plug it into my motherboard with out ordering from across the globe at stupid prices.

 

[Paperdoc]

Do not plug it into a motherboard fan port. Your best plan is to leave it connected directly to the PSU and running full speed. Why? Because you have no way to know how much cooling your GPU requires.

The controller on the GPU card controls fan speed according to an actual measurement of temperature inside the GPU chip on that board. Now it does not work, so such automatic control is not possible. If you connect the board's fan to a mobo port, that fan will become controlled by the actual temperature measured by a sensor in the MOBO, not in the GPU chip. If your case cooling is good, that control system will slow down that fan because the mobo does not need more cooling. BUT that is probably the WRONG fan performance for the GPU chip! You could end up overheating and damaging your GPU chip.

You only other option would be to use some utility that came with your GPU card (sometimes a part of the card's driver software) to observe the GPU chip's temperature. Often such cards have a utility that will display the actual temperature measured by that same sensor that the original fan controller used. Even if the controller circuitry has failed, maybe the temp sensor is still working. Then you could buy / install a manual fan speed controller for that fan and adjust the speed yourself. BUT that means you would ALWAYS need to monitor the GPU temp and adjust fan speed as your graphics use changes.