As of 2013, at least, the Intel chips were pretty good. Not top-of-the-line by any stretch, but 1/2 to 2/3 as fast as the discrete chip in my Macbook: http://ar

As of 2013, at least, the Intel chips were pretty good. Not top-of-the-line by any stretch, but 1/2 to 2/3 as fast as the discrete chip in my Macbook: http://archagon.net/blog/2013/12/19/late-2013-15-macbook-pro-intel-iris-pro-5200-vs-nvidia-750m-and-other-stories/ http://archagon.net/blog/2013/12/19/late-2013-15-macbook-pro... Still, I'd want as much power as humanly possible for gaming on the go. 15-20 extra frames per second matters a lot.