geoffduck :
1.) You did not say what you want to do with this system. - Gaming
2.) You did not mention your current CPU. We cannot recommend an upgrade for the same socket if we do not know what you are wanting to upgrade from. - AMD FX 4300
IT is NOT WORTH IT to upgrade having that board, I don't even think you can overclock or get a stronger CPU and even still
Wether you have a phenom II CPU, a 4-core FX or an FX 8350 performance won't change a lot.
The AMD FX lineup didn't do very well when they came out and even nowadays many games aren't optimized for fully utilizing 6-8 cores so you will be held back by their very low single-core performance.
If you want a reasonable upgrade, I'd get a ryzen 3, a B350 motherboard and DDR4 memory but I think that's going to be more money than that. Which GPU do you have?