Jonas, you're comparing an APU to a CPU. The apu is obviously going to be better in graphic intensive things - that's what it was designed for.
For cpu performance (if you had a dedicate gpu or render videos or so) the I5 is more than twice as fast.
As for I3 vs Fx in games, the I3 would probably win in 80% of all games and perform similar in 15 out of the remaining 20%. However, getting an I5 4460 isn't that much of an extra and should be worth it, especially for online games.