Its not about the graphics. Its about pcs cpus only having 2 or 4 cores while the ps3 has 8 (7 running). Ps3 games are designed to use 6 of the 8 cores so running a ps3 game through a processor with only 4 cores would not work. If we could create virtual cores and access the processing power of the gpu for general processing then we might get somewhere.
-reply by Alex