hehe ad. i think that's too high resolution. Most of the pro players (assaulter) play on 640x480 because bullet spray is easy to watch and u can control accordingly. And the pro awpers generally play on 800x600 except some ( markeloff, walle , delpan play on 640x480). I haven't heard any pro player playing on 1024x768.
Moreover lower is the res. less is the quality of graphics but higher would be the graphics performance :)
I myself play on 640x480