Your apu has weak cores.
DOTA, I think depends on a single fast core.
If you have the A8-7600 and are considering an upgrade from the excellent integrated graphics, do a test:
Run YOUR games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.
If you are considering buying a A8-7600, reconsider if you have any interest in gaming or a future upgrade.