
This image is taken directly from leadtek's website. Note the little performance graph on the box? I'm struggling to work out what the benchmarks are (the second looks vaguely like Company of Heroes) but it says the 8800GT performs 10-35% better.
Propaganda to be taken with a pinch of salt? Leadtek is an exclusive nVIDIA partner...
Edit: the page the image is from: http://www.leadtek.com/eng/3d_graphic/overview.asp?lineid=1&pronameid=383