If you have 50 bucks to spare, hop onto Amazon and grab yourself a True Spirit 140 Power. Its a big tower. But, it leaves room for you to access everything on your board. It does not impede ram at all. It is tall, and a bit wide. If you have a couple of bucks more.. pony up and grab yourself a TY143 to go with it. You probably wont be disappointed. I used to run an H100 with 2, or 4 120x38s if I had the space. Those moved 100cfm each. Worst case scenario, you sell it and get your money back, or you have a spare cooler for another rig, or you have a sweet dust collector. I do also have Le Grand Macho RT, excellent cooler. Not as tall as TS140P, but about as wide, and it will cover most of the top half of the motherboard from the cpu back. It will not impede your ram either. And you can run it passive if you'd like, not too sure about overclocked though. Its good for 320w, and TS140P is good for 360w according to Thermalright. Just thought Id mention it since you were on the fence. LGMRT performs on par or slightly better than D15, and TS140P outperforms LGMRT by a few c in my setups. Especially with TY143. The TY143 is 130cfm, and TY147A, and TY147B are about 74cfm. TY143 shares the same sound characteristics as 47A and B up until about 1500rpm.