ahh... i promise you and will even put money on the table that in about 10 years games will require or recommend a PPU...
O and about the differences in graw, my friend has graw and a uber PC.. he is a graw freak so spending $300 isnt so bad 4 him.
I played Graw on his computer and noticed that explosions look so cool, i mean instead of 10 things being pushed or exerted out of the explosion, their are prolly 100's. Then i played Graw on my comptuer and felt inferior. I almost went out and got myself one.
Maybe PhysX next model will put more into their model and hopefully by then their will be many games to support it. Whenever this happens i promise ill get one.