Well first of all a SSD doesnt at all improve fps in any game , it just makes it so you load the game faster : loading screens start up of the game etc.
And i dont think your system can run that game at a stable 60 fps , maybe 20 or so i do not know ( haven't played the game myself)
Second. a ram upgrade will give you 2 or 3 more fps in games , but you will see some improvements over 4gb outside of gaming