You will only need an nVidia with proprietary drivers if you want to run the latest games on the highest quality settings, if you just want to play the game for the sake of the game and not to impress your friends then on lower quality settings the current Intel APU part should be able to give you a playable framerate of say 20FPS and so is _fast_enough_, even for AAA games and will do even better on the fantastic indie games which are being ported to Linux in droves. Valve has even been doing development on the Intel driver to make it work better for their first-party AAA games, I would expect Dota2 to work well, but I don't have a high-end Intel APU to test with.
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