The 8800GTX (released in the same month as the PS3) was, is, and always will be a more powerful GPU that has run all games also on the PS3 with higher settings, resolution, and/or framerate because it is a vastly superior GPU and there are some scarce benchmarks floating around out there proving that old x1950s and 7900GTXs do handle at least console-level settings on modern games (saw one for the x1950 and Crysis 2). Even my laptop's GT 550M is, in fact, weaker than an 8800GTX by a good amount and handles all games I test on it significantly better than my PS3 ever did. Uncharted 3, Killzone 3, and God of War 3 aren't doing anything an 8800GTX can't handle. Just because most PC gamers have moved past these GPUs (well, I'm sure there are a still 8800 GTXs and GTSs in use out there, GT's probably more common though) doesn't mean they aren't capable of equaling or surpassing PS3 capabilities, it's just a matter of being 7 or so years old and not handling games at the standards PC gamers can achieve for cheap these days. Console level 1280x720 or lower with low-medium settings and sub 30 fps aren't exactly an ideal and even sub-$100 GPUs these days are easily well-beyond those capabilities. That's why ancient GPUs don't tend to stick around in large quantities, because console settings and performance are archaic and PC gamers have little reason to stick to them for years on end. The standard resolution for PC gamers back in 2006 was already above 1280x720 and 30 or lower fps with little to no AA has never been something PC gamers idealized. Of course they moved past 2005/2006 GPUs, especially with the improvements being brought about by unified shaders and DirectX 10 in newer GPUs at the time.
Meanwhile, it was only the year after the PS3's release and it couldn't run Crysis. When it did finally get the original Crysis, it had to be remade on a more optimized engine, and only ran at around 18-25 fps at 1024x720 while the 8800GTX could run it at 1920x1080 with high settings (no AA) at around 30 fps in 2007.
Here's an x1950 running Crysis 2:
http://www.youtube.com/watch?v=jHWPGmf_A_0
Here's a 7900GS running Skyrim:
http://www.youtube.com/watch?v=IBhk_bPan6U
Finally, here's the 8800GTX proving its superiority:
The new Tomb Raider at 1650x1050 and 60 fps -
http://www.youtube.com/watch?v=outsDtByQwo
Battlefield 3 -
http://www.youtube.com/watch?v=dw_MmOgBw1Q
Crysis 2 -
http://www.youtube.com/watch?v=UiC58OM0uOI