Hello i have a Hp envy 700-406 and it came with an A-10 7700k 3.40 ghz APU and right now i got it matched with a Nvidia GTX 960, i was wondering what would be a better cpu and gpu combo, an A-10 7850k or an A-10 7870k i can buy either of these cpu's im just wondering what one would be best with my GTX 960, buying a new motherboard for a new socket type is not a option, so please dont bring it up.