I don't know what are you specs but SSF can play all my games ,which is single core P3.4GHZ (that's an old processor) 1GB ram ,256 ATI VGA.
It can even run games well at my cousin com which is an AMD 3200+ 2.01GHZ ,1GB RAM ,256 VGA (and this pc is even older than mine).
So a P4 at least 2ghz should be able to play many games.