HOLY MOLTEN SILICON! I expected it to get warm, but not uncomfortably-hey-that-burns hot. I dont think I want to play games on this. If you're gaming on a rMBP you had better be doing it with 2 games and you had better be a casual gamer. If you're going to game out on PC straight up get a desktop. The way this thing runs hot is ridiculous and Im sure a stacked 15 inch RMBP with the Nvidia chip would get just as hot, and at that price you could get a fat PC. Gaming on this is not something I want to do often and I tone down the graphics to the bottom third to keep it comfortably warm, not burning. I've only tried running LOL and Bioshock and this thing is a beast. Finally integrated graphics can run admirably, it only took 15 years. Admittedly LOL is about as non intensive as an aged Blizzard game and Bioshock is a 7 year old game so no big deal but overall Im pleased and impressed.