yeah I heard those hybrid graphics with the hd6670 are crap, and nobody could ever come up with a decisive answer if the ddr3 or gddr5 version was better...they claimed the APU had to slow down to wait for the fast gddr5 hd6670. Meh. Never once saw anything official from AMD on the matter.
My bro paired a gtx660ti with his a10-5800k and has been able to play anything he wanted smoothly on ultra 1080p settings. It's essentially the athlon x4 750k tom's recommends often for budget gaming on 1080p