Well, it was probably 1920 x 1080, as that's the Full HD standard resolution. But no, you don't just go off and switch that to 1600 x 1200 from that and be good with it, as you .. /%&¤&%... the resolution this way way too much.  Aka from HD1080 to UXGA and expect it to work, as the aspect ratio is totally off, the game looks stretched, beyond abnormal. Well, unless your eyes see differently.  What a normal dude should do, is to start with the native resolution of the given monitor..