if A10 5800K is not overclocked , 70% ,otherwise 60%.
tests (with gtx 680 full hd resolution , your r9 290x is faster , 5 games tested)
A10 5800K - 58.2FPS
i5 3450 - 94 FPS , i5 4440 a little faster
FX 8150 - 73 FPS
i7 3770K -105.8 FPS
Get i5 4570 or higher .