Exactly what model of A series cpu do you have?
I doubt that you would do better with a FX-8350.
For example, the A10-7870K has a passmark rating of 5579 and a single thread rating of 1506.
It is the single thread rating that is most important for gaming.
Few games can use more than 2-3 cores.
The FX-8350 has a passmark rating of 8949 due to more cores, but the single thread rating is the same at 1504.
I think you would be disappointed.
If you are going to buy a new cpu and motherboard, buy intel skylake.
For most games, a $125 I3-6100 will game better than either.
Passmark is 5500 and single thread is 2102
Here is a review.
http://www.anandtech.com/show/10543/the-skylake-core-i3-51w-cpu-review-i3-6320-6300-6100-tested
spoiler, the i3-6100 prevails over either if you are using discrete graphics.
If your budget is sufficiently high, in the $225 range, I would bypass most skylake i5 processors because for a small amount more, you can buy a I5-6600K with a overclock and get 30% more cpu capability.