yeah you cant mount the thermalright 120 extreme vertically on that board without some modification to the upper most heatsink on the dfi board because its a few cm to high. it fits horizontally but it blows the air either onto your vid card or psu so be careful.

I'm gonna chop down that heatsink at some point so i can reorient the cpu heatsink and get a ram cooler.

oh and you wont be able to get ram with any funky heatsinks on it because when the thermalright is horizontally mounted it overlaps the first ram slot