Are you being deliberately obtuse or are you just a bit slow?
We'll make it simpler.
3 YEARS AGO.
Half Life 2 is released. The top end card of the time was the 6800GT. This ran it to the max, balls to the wall, mentalist style, with plenty of frames per second to throw around.
However, I only had a GeForce 4 Ti4200 at the time, a card two generations old, somewhat into the realms of being obselete. I could run HL2 at a decent resolution (1280x1024), most settings on high, albeit with no pretty DX9 effects and maintain a decent (40fps+) framerate.
FAST FORWARD 3 YEARS TO THE PRESENT DAY
Crysis/UT3 are released. The top end card now is the 8800GTX. Hell you can have two if you want. These will run UT3 and Crysis pretty damn well, turn the settings up, everythings nice.
However, I only have an X800XL, a card two generations old, somewhat into the realms of being obselete. I can't run Crysis/UT3 without it looking either like a dog has thrown up on my monitor or it being slower than a collections of screenshots being run in a slideshow.
Do you see what i'm getting at now?