Sanjo Renomitsu said:
Hmm, how good do your think your video card has to be to handle this? I got a really nice one, but I just want to make sure. It's a radeon 9800 pro.
You'll see no noticeable difference if you set your texture resolution (overlay resoluton) way over your real background resolution. For example, if you're running at 1600x1200 background resolution, set your texture resolution to to 1600x1600. Anything above 1600x1600 is just extra work for your graphics processor.
I myself have a Radeon 9800Pro. When I tired 2048x2048, I experienced a slight slowdown in framerate. However, there was no noticeable improvement in video quality over 1600x1600.