Sigh, once again we have a debate over two things that can not be really be compared in the first place. I don't think anyone is doubting that a SLI 7800GTXs system would most definitely have more raw graphic processing power than the X360. But that's not really an argument, it's just a mathematical fact. But comparing PC vs. Xbox 360 games however is more than a matter of math.
Also for the person who said that games look better with a 512MB GTX than say a 256MB 7800GT, you do realize that the only difference between those two cards are performance correct? There is absolutely no difference in visual quality or IQ. Merely you get more FPS with one card and less with the other card.
There are many ways for a game to look good and resolution is merely one factor. For instance, texture detail in FEAR isn't exactly super (for such a new game) but the shader/ballistic effects more than make up for that. On the contrary Quake 4 can't quite compare with FEAR when it comes to effects (ballistic or otherwise) but it has better looking textures so visually it is comparable.
I am an avid PC gamer and while I do own both the PS2 and Xbox I would say that 80% of my gaming is still on the PC. However, I have seen and played PGR3 on a 42" LCD TV and I must say that to venture that PC has a comparable racing game with the same amount of immersion or detail is well, a fallacy. Higher resolution for games on the PC is a moot point if the engine itself is inferior. Play Quake 3 @ 2048x1536 and then play HL2 @ 1024x768 and tell me which one looks better. In the same fashion, if a game's engine is not capable of the same level of detail or immersion (dynamic lighting, HDR, motion, etc.) raising the resolution or IQ won't help. Beyond technical elements there are of course also artistic elements to compare. A technically better game engine may not produce a better looking game than a technically inferior gaming engine that utilizes better art.
This can even be said of say comparing Doom 3 engine vs. Source engine. Undoubtly few of us would contend the Source engine is better from a technical standpoint. However, while Doom 3 may have been better from a technical standpoint, I thought HL2 looked better overall.
Graphics are not 100% technical. Graphics is a form of art after all and hence very subjective. However, I would say that even from that angle to say NFSMW on the PC even at higher resolutions is comparable to PGR3 on the X360 is is well, mid-boggling. For example:
http://img.gamespot.com/gamespot/images.../reviews/927142_20051031_screen001.jpg
vs
http://img.gamespot.com/gamespot/images.../reviews/927245_20051117_screen001.jpg
How exactly is NFSMW comparable to PGR3 again? And remember those are just still pics and doesn't even taken into account how incredible PGR3 looks in motion (not to mention the "cockpit" view is amazing)
Just my opinion of course,
😉