that would take a major hit on a cpu that doesnt hyperthread. go with a 4770 it would be more ideal for this situation
If I understand correctly, using shadowplay takes load off of the GPU and quick sync drops CPU usage like crazy during streams. I've seen reports of shadowplay only dropping FPS by 5-10, and quick sync uses the integrated graphics for all of the encoding. The only CPU usage he'd have would be split between xsplit, the game itself, iTunes, and the twitch dashboard. I think he uses Firefox.