You are in a car race. The cars are going around the track at 150-180mph. Your pc is averaging 50-60mph. While moving up to the Intel will be a decent sized leap in performance, it's still only averaging 80-100mph, you'll still come in dead last, miles behind the leader. The distance just won't be as far as it is now.
Only you can really say if it's worth it, really, since any really low fps are still going to be low, just not as low. You might move from 20fps in a game to 35fps, a really sizable jump, but that's still almost as unplayable as before. Whether that's good enough is for you to decide.