I can say with a fair deal of certainty that the PS3 does not use a Nvidea 7900 GPU in its console design. It is however very likely that both consoles GPU are based on reference designs for PC counterparts. It is however hard to truly impart any judgment between the two based on hardware specifications as both companies have misleading information in regards to their true prowess. The 360 landing page for its technical specifications state that the system can natively display content in 1080P which has been visited extensively and proven false, it display content in 1080P in the same fashion as any PC can by simply scaling. As far comparing the two the general public is left to judge the two's prowess by their real world experiance with titles that utilize the two at the peak of their capabilities and in this arena the PS3 prevails. I can attest from owning both consoles that it is seldom likely you can find a title that even comes close to MGS4 or Killzone 2 on the 360. In the end, for me it matters far less as my PC makes quick work of both consoles and even excels on games that are offered on all three platforms. To say the 360 is in almost an way technically superior to the PS3 is about a sound idea as the world being flat, the concept alone is stupid. The PS3 had much more R&D time and is still far superior in failure rates alone.