Hi,
I have an A10-5800K @ 3,9GHz (almost same gaming performance) and i can give you a clear view over it's performance.
I used the A85X chipset with 8GB of 1600 MHz ram:
- Crysis 3 -> Low-Med 1280 x 720 -> 30 FPS (very playable)
- GTA 4 -> Low-Med 1680 x 1050 -> 30 FPS (playable)
- Chivalry, Medieval Warfare -> Low 1680 x 1050 -> 35 FPS (good playable)
- ARMA 2 -> Very Low 1680 x 1050 -> 70 FPS (medium settings is 30 FPS)
- NFS The Run -> Medium 1680 x 1050 -> 25 FPS (just playable)
- Company of Heroes -> Ultra 1280 x 720 -> 55 FPS (incredibly playable)
- Sniper Elite V2 -> Low 1680 x 1050 -> 25 FPS (When looking through the scope, you notice the lag)
That's about it so far. On Low settings, i think you can calculate what it would be approxmately. I can certainly play any game, on low settings though, and with something a GTX 650 or GT 640, when having a low resolution, you can play a lot of games at medium settings or higher.