The benchmarks between the GeForce 6800 Ultra and the Ati Radeon x800XT Platinum Edition are extremely close. The benchmarks are so close many are saying you have to base your decision on price, or whether or not you have room for the nVidia. BTW, nVidia saying this card must run on at least a 480wt. power supply is bullshit. It ran on a variety of different power supply's including a 400wt. and a 300wt. when tested by Maximum PC, which BTW you should all subscribe to because it's probably one of these best decisions I've ever made in my life! The Ati ran slightly faster because of it's higher core clock speed, but the difference is negligible. The nVidia did slightly batter on shader heavy benchmarks because of it's Pixel Shader 3.0 technology. It will probably run Doom 3 a little nice because Doom uses lots of shading. BTW Doom is due out August 3rd. FINAL DATE NO SETBACKS! If you want to see comparisons between these to cards, do a google search, you will find tons of results, or pick up any computer mag from the last 2-3 months to present day. I WILL ARGUE IF ANYONE WANTS TO ABOUT WHICH CARD IS BETTER, IMO THEY ARE EQUAL, YOU SIMPLY CAN"T DETERMINE A WINNER! I hope this helped someone!