gamerk316 :
Your forgetting a few things here:
For one: Both a 9800 and a 7800 draw the same graphics in DX9 mode, its just a matter of how quickly they are drawn.
Secondly: Your PS3 doesn't have a program called Windows that is designed for the sole purpose of slowing down your games.
Finally: A ps3 is specifically designed for games, a PC is not. As a result, the same graphics can be drawn faster on the ps3 because it is better optimised.
When you compare any PC/Console title, the consoles often win in the graphics department simply because of a near steady 60-FPS. The one disadvantage consoles have is resolution (although 1080p is 1980x1600).
Of course they draw the same thing. That is irrelevant. The 9800 will draw it at a higher resolution with more filters while maintaining a playable frame rate, which is what I meant. If you interpret it the way that you did, you could also say that the Intel GMA X4500 is capable of drawing anything DX9 as well (I think it can do DX10 too), bu that doesn't mean that it is fast enough to use that full capability at decent frame rates.
Second, Windows doesn't actually slow down your games that much
Finally, the optimization isn't really the case. While it is true, the difference isn't that huge. The biggest difference is actually the resolution - even 720P HD games are only 1280x720 resolution. Only 1080P games rival PC resolutions, and as a result, most people play PC games at significantly higher resolution than consoles. This allows the consoles to get away with a lower power GPU while still running fairly smoothly.