I found this vid quite interesting about Deepmind which kind of shows where things have got to. Their AI algorithm can learn to play Space Invaders and Breakout better than people starting from just being fed the pixels. It doesn't do well at Pacman though because they have not cracked getting it to understand spatial layout and planning ahead. https://www.youtube.com/watch?v=xN1d3qHMIEQ
Update: Nvidia's Pascal GPU should be 28 terraflops, out 2016 and given much of the brain is not active at one time that's probably getting to similar processing power. It uses 1.3kW so you can heat your room with it too.
