I know this thread is crazy old, but I just wanted to share that I have a Corsair 200R, and easily installed a 240M radiator in it. Low profile RAM is a must, though. You just have to put the radiator screws through the mesh at the top. Last week I upgraded to a 280MM EVGA CLC AIO and although I had to uninstall and then reinstall the back fan in order to fit it in (and also make sure to put your CD drive in the lowest bracket), IT ACTUALLY WORKED! You can install a 280MM radiator in the Corsair 200R! This case just seems to be the gift that keeps on giving!