do you mean make the ps3 more powerful? adding ram and better gpu or overclocking cpu? No you cant.
It cant become a pc, as its a different format, reads a different code. i believe you would need the ps3 to run a pc emulator (does such a thing exist) and as a ps3 is not as powerful as a 2-3 year gaming pc, why would you bother.
The other way around would be more viable and prob possible in the future.
A ps one an two emulator are available for your pc.