Does this game just not support it? I've tried forcing it via the Nvidia Control Panel, RivaTuner, and even D3DOverrider. The last option did work but I then get immediately booted from the servers probably because Nguard sees D3Doverrider as a type of hack. The screen tearing is unbearable and my video card is getting hot attempting to render over 100+ frames per second.

Any ideas?

EDIT: I just tried pushing the Anti aliasing to 16x and didn't see a lick of difference in-game. Something is wrong with DBO, it's not complying with the video driver forced enhancements.