melodymoony :
SlitWeaver :
The top of the case, where the pre-installed 200mm fan comes?
yes that's right
can I mount a 280mm rad up there?
Sadly, the best answer I can give is to take some measurements and see what you come up with
If you haven't already, you should ask around on numerous forums (CM has their own forums, right?). Hopefully someone with more knowledge of the case can jump in and help, or maybe check the "overclockers" section (just cause?)? Sorry I can't help more. The measurements say probably not, but I don't have the case.