Cpu chat

In games and video/image editing yes.

Maybe..
FX cpu's do not have integrated video cards and what you can get integrated on a othbd is usually pathetic for anything besides basic office work.

So, as said, if you plan on gaming, rendering, encoding... anything capable of using the processing power of your gpu - then yes you will see a noticable improvement.

performance gain compared to what?

Probably against integrated graphics....

you would think but asking in the cpu section . . . just making sure.