Quote Originally Posted by wildsprite View Post
the max 3D res for windows version is 2048x2048, the 360 version doesn't even come close to doing that, I have mine set to 2048x2048 with 1366x768(max res of my laptop display, this is a non standard background and must be set in the config first before you tweak the 3D res, don't try to go above your max res for the background, the game will crash) background
I set my bg res to 3200x1800, and it works fine.

Also, setting it to 2x your main resolution will be better than using square resolutions.