on the outside at the back on the case (where the sockets are) is it possible to put a fan there, i can fit my old 80mm there and it will be sitting right over the exhaust bit of the graphics card, i imagine it would greatly improve temps but is there anything im missing when doing this? I can thread the wire through the gap at the back of the door on the other side and then have a wire from my fan controller I remember a friend saying something about the airflow stops when 2 different fans are near each other thanks for any help I'm not sure what ill use to attach it, by the looks it, it will have to be cable ties one side and then blue tack as well
Move your hdd up to the 5.25 bays to open the airflow. You can get 3x5.25 hdd mount with a 120mm fan for this, which are nice. It also adds a little airflow for the upper portion where the cpu cooler is, like a wind tunnel. So the bottom intake fan can PUSH air through the gpus fansink and out. If thats still not enough, use a stronger fan in that area. I wouldn't mount a fan in the manner you describe, you won't be able to mount it solid and likely to make a lot of noise rattling around and not be that effective.
Just wiring it in place won't help much - if you built a shroud (as air tight as possible) then it will probably help a bit, though it'll be your overall case temperatures which will benefit most. To use the fan to it's best (for GPU cooling) , you should utilize the empty bays underneath. Put the fan there blowing air in, duct it to the GPU's fan (over-pressure would be best, so the new fan should have a higher CFM output than the GPU fan) and put a baffle between the GPU exhaust and the new fan. Like magic your fan is getting ambient air rather than case air.
