Is it best to play Mame roms in a low desktop resolution, like 640x480 or does running at 1024x768 give the same picture? Any disadvantages to using a particular resolution or can you use anything? (I have a 17" 5:4 1280x1024 monitor and I run games in 1024x768 mostly as running at 1280x1024 it doesn't go full screen)