Originally Posted by tuxfan
have found this tip ( think it was on crysis-hq )
Open the file "game.cfg" in directory "C:\Dokumente und Einstellungen\tuxfan\Eigene Dateien\My Games\Crysis_SP_DEMO"
insert this line into the file and make it write-protect.
r_MultiGPU = 1
This must be how Jonelo did it. I'll give it a go tonight. Cheers