I have one system with amd A4 5300 + hd 7750, they are both kinda weak, so thats why they are ideal for eachother
And on another system i have Athlon 760k quadcore (similar to your A8) with R7 370, in some games its fine, and in other badly optimized or cpu intensive games its not so great, its a bottlneck even for that gpu, Arma3 struggles. I would buy another platform if i were you, that amd bulldozer single core is crappy, but it depends of what games u wanna play. Sure it will be faster with 7750, for Dota2, lol, cs:go and such
Btw your english doesnt make any sense in your last few posts, care to elaborate a bit more so we could understand what u talking about