You can add a HD 6670 to the 5800k and run dual graphics but don't expect miracles. The 5800K, by itself, can run bf4 on med settings at least(maybe high) @ 720p, the i3 cannot.
The i3 would be better though if adding a worth while video card. The i3's single thread performance is so strong, it easily equal's the A10's overall performance.