I agree with LucoTF. I used to have a A10-5800K and added a HD 6670 in Dual Graphics Mode. The improvement was really hard to detect. frame rates were almost the same as with just the discrete card alone. And Dual Graphics is not supported in every game. You would be better to grab a faster single discrete card and go with it instead of the on board video.
Even if you don't get 60 fps, 30+ fps is still smooth gameplay.