172X is pretty much at gaming... if you're running 1600x1200 any game will be slow enough for LCD.
Joke. Its native resolution 1280x1024. And for this diagonal, I think 1280x1024 is the best resolution you can get. By the way, there're many games that don't even run at 1600x1200. BF, for instance.
On my top notch box, UT2k4 is really sluggish at this resolution. You can enjoy views, but not play at 30-40FPS.