I recently purchased a Xigmatek Gaia heat sink and was confused on the placement and direction of the fan. I currently have the fan below the heat sink but it is blowing air down onto the video card which I'm assuming is incorrect, should I turn the fan around to push air through? Or should the fan be placed on top of the heat sink, pulling air through and up and out the top of the case where I have an open fan slot? I've included the current placement in the image below.
The fan needs to be pushing air through the heatsink fans, as its always more efficient for a fan to blow than suck, so just rotate the fan so it blows air through the heat sink and out of your case , im asuming your case has a roof mounted fan vent.
Heatsink fans must always blow air out of the case.
Either 1) blowing air towards the rear of the case and out (the rear fan will help do this).
2) blowing air upwards towards the top exhaust (on cases that have a top exhaust) and then out of the case (the top fan will help do this).
Never direct the heatsink hot air towards the video cards because video cards run hot and should not have hot air blowing on them.