i doubt that i have a 7900 GT aswell and i also get high ping around 50 ms also the other day my friend came over and we had a lan party and he got about 30 ms where as i got 40-50 ms i also put back in my 6800 card and found that i get a ping of 0 ms now i am almost certain this is due to just bigger HDR lighting packets but i have yet to find out the main mistery of what is causing this