The Pi is overclocked _not_ and was previously under full load at about 66 ° C, now I can do it in 45 minutes Stress test not more than 54 ° C ... very impressive for as little aluminum.
The only drawback: The installation of the RPI was briefly a little tricky.
1) side wall of Case out Schauben (small screws at the bottom) [it is sufficient page]
Screw 2) spacers from the case and then install the screws on RPi
3) The RPi Carefully slide in the housing until the spacers can be seen at the bottom of the screw holes
It was tricky with the USB ports on the other side with me because they were minimally inclined soldered on the board and thus did not fit exactly into the opening of the page. Could with gentle bend but be remedied.
4) all retighten
5) completed