Didnt i tell you that woot ? :P well also it has to match ur native resolution on your screen i think, as whenever i try a lower one it screws up.
For example i have 1920 x 1080 but if i tried yours it kinda just pushes up the screen showing some desktop behind, and goes a weird colour :o
The game dont like it but as long as it matches ur resolution you should be fine :P + if ur used to standard 4:3 resolution you wanna add +20 to your FOV. :)