If you have a rad in the front it’s blowing hot air into the case so you need to suck out even more air than usual unless you switch the way the air goes.
While putting a rad in the front as intake will make the air slightly hotter, it doesn't really make a difference in GPU temps. The temp difference of the air will be minor, and the difference in temps of the GPU, for example, is within margin of error, since it's more important that air
is flowing than the temperature of the air. Sucking out more air than you need to will basically have the same effect as pushing in more air than you need to, but it will accumulate more dust. If you put three fans on top as exhaust, air will start drawing from small holes in the case, PCI covers, etc. since not enough is coming from the front. If you put three fans on top as intake, the air will instead go out of said small holes, but more of the air from the front will go to the GPU instead of the CPU. In both cases, the GPU will have lower temps, though.
On another note I had a x58 system with a Xeon I overclocked to 4.5ghz and had to use a bathroom vent fan to cool it but atleast I got 1000 in cinebench r15
That's pretty awesome though.