i installed thermalright sk6 with delta 6800rpm on my cpu
first i installed the fan to suck the air away from the heatsink (sticker was on top) the temperatures were cpu 54C and MB 39C
then i saw pictures of the cooler where the fan was installed to blow air on the heatsink (sticker was on bottom), so i did the same
and asus probe shows that CPU 51C and MB 40C
so make your own conclusions