Is it worth upgrading (cpu)

Solution
Aside from the fact he would need a new motherboard anyway to go from an A8 to an FX, they are FM2 vs AM3. There is no firmware upgrades anywhere.

Don't waste the money.

game junky

Distinguished
wait for zen and see if it will be backwards compatible with a firmware update for your existing motherboard - they will be a significant performance increase and will likely decrease the price point for existing AMD CPUs. I have an 8150 in my secondary rig - it is running with a 770 doesn't provide the same consistent game experience as my i5-6500 and 950.

Your call, but I wouldn't go for the 8350 or 8370 unless that was the top of your budget