From all the actual tests, you can max out a APU all you like but realistically for 2013 forward gaming you would be SAVING money by instead gettings a i5 or FX-8xxx PC for gaming, since the APU will choke EVEN with a GPU add on. APUs are made for Low Cost, Low Power, Low Performance (Grandma checking Facebook, then email) systems for the 90% of the computer users out there, not for gaming.
Here is verses the OLD i3 Core, not the current Haswell (4xxx) chipset
http://www.hardwaresecrets.com/article/A10-5800K-vs-Core-i3-3220-CPU-Review/1646/19
"You have to understand, however, that depending on the game, you won’t be able to achieve a good frame rate (i.e., a good gaming experience) even when lowering all image quality settings to their minimums. From the games we ran, we achieved a terrific frame rate on StarCraft II (almost 80 frames per second), a good frame rate on FarCry 2 (around 40 frames per second), and a playable frame rate on DiRT3 (36 frames per second). However, on Battlefield 3 and Borderlands 2 the frame rate was below 20... Similarly to what we learned with the previous generation of AMD APUs, the A10-5800K lags behind its competitors in general processing performance. The Core i3-3220 is faster than the A10-5800K for day-to-day operations"
NOTE: The SUCCESSFUL gaming for a A10 is on 2009 era games, anything 2010 forward "lags behind its competitors in general processing performance" as these games, and especially 2013 forward games (AC3, BF4, etc.) all demand as much from the CPU to do 'work' as it asks the GPU to render.