are they your vids. I see in the sig you have the following setup
3800+ x2 @ 2.6GHZ 288FSB ,2GB GSKILL DDR 3 3 2 8 244MHZ , SLI-DR , X1800XT 512MB 702/801 , SAMSUNG 913N 19" TFT
I have a 3800 x2 @2.8ghz and X1800XT 256mb and 2gb gskill. It runs no where near as good as yours. What settings are you running at?