Link:
http://gamershell.ii.net/cgi-bin/fh2.pl?auth=ndKiwJamypYwg&id=25620&ts=1210391929&cat=demo&filename=grid_demo.zip
ftp://downloads.codemasters.com/demo/grid_demo.zip
http://downloads.gamezone.com/demosfiles/t28774.htm (7mb/s!)
I must say that cars this game is quite difficult to control, especially for the keyboard users...
but overall the graphics are stunning, and it will be smooth for most users , and the minin req. is 6600GT or 6800GT
PS, if you crash your car too seriously, you may break your front wheel and unable to race anymore