Will I be able to play Overwatch with AMD A-SERIES X4 A10-5800K BE 3.8GHZ SOCKET FM2
System requirements are here
No, the A10-5800K does not meet the minimum requirements. If you give us your power supply make and model and a budget as well as a target resolution and detail level we can give you some recommendations.
I'm sorry but I really have no idea about the target resolution and detail level (I'm just here trying to help my son). Reagarding budget, what are we talking about, a new graphics card? New cpu? New computer? Here's a list with the current components (power supply at the bottom)
Just a new graphics card. Overwatch isn't that particularly demanding on graphics so a $100 RX 460 can push 60fps in it
But be advised the RX 460 won't stand up in really demanding games, like The Division, without sacrificing detail levels to hit 60FPS
Your power supply is...Let's be kind and say mediocre, but the RX 460 sips power at less than 75w/6.25A so there shouldn't be any issues