I have the Pro 4 (i5/4GB RAM). I can run Steam with no issues...as long as that's ALL I'm running. I play older games like AoE II, StarCraft, Homeworld 2. I like to live vicariously through my old PC gaming days and that about does the trick for me. Otherwise, if I'm playing anything newer it's usually me streaming my Xbox One to my Surface. If you spec it out enough, the Surface Pro is not a bad gaming machine.