I use an aio watercooler (see post above). I don't think it was my best idea
I can handle the temps if i don't overclock and if the graphics card is undervolted. Then my temperatures both cpu and gpu are quite well, but only if i use my reference graphics card wit radial cooling.
i used a custom graphics card with axial coolers for a couple of days and it almost killed my machine. axial coolers don't blow the hot air from the gpu out of the case and it gets quite hot inside. i measured a total of 50°C air temperature in the case, if i use the axial cooled gpu!!!!
that's ridiculously high.
So no matter what cpu-cooler you are using: Never use an axial cooled graphics card in this case.
Also i don't recommend using an aio-cooler, first because you dont get better temps, and second it is quite big an interferes with a standard atx-power supply. you need a power supply smaller than 15 cm's to fit in the case if you are using a aio cooler.
And last but not least: I recommend to blow cold air in the case from BOTH fan postions, it was the setup with the lowest temps for me plus it cools the SPAWAs (volt regulation something, i don't know how it's called in english) and the gpu backside as well.