You can probably accomplish light gaming with that at the moment. By light I mean things such as small indie titles on Steam, perhaps LoL and Dota with details turned down. You may be able to attempt some more taxing games with the resolution and detail settings low.
If you're looking to get a graphics card, let us know what PSU you have and we can suggest some. Also, fair warning, even with the best of GPU in there, that A6 will become a bottleneck and you may struggle to play the latest games on high detail settings & resolution.