I tried a lot of fans behind, in the middle and over the cpu/gpu and they all add to the temperature, no ,matter if they blow or suck the air...My Noctua NF-A12x15 seems to be just slightly too big to sit behind my graphics card. I could fit it in there if I wanted to but it would push the graphics card and also bulge the side of the case a bit. Has anyone run into this issue as well?
So putting NO Fan over the GPU is the best option. I will demonstrate it later in the 1070 S4 thread.
it woud be great if you consider taking 2 mm off to fit the flipped HDPLEX powerconnector: