i3-3220 > Any AMD processor.
An AMD Phenom II x4 and a Trinity A8 and A10 compete with the i3s perfectly fine in gaming performance at stock. Overclock any of them and the i3s are left in the dust. AMD's six and eight core FX CPUs also beat the crap out of the i3s when you either disable or cut cown the P states of the second core of each module and there are other tricks that you can do with them to make them even better such as CPU/NB frequency overclocking (can't do it on Intel, IDK if Trinity can do it well). AMD can compete far better than you give them credit for, especially for enthusiasts.