I've decided that I'm going to upgrade from my 13" rMBP. I'm going to go today to pick up a new 15" 2.3, 16, 512 with the 750m in it. I currently have my 13" for most stuff and an Alienware mx14 for gaming. That Alienware is ok I guess, but it's like a clunky dinosaur compared to my Macbook. So I've decided to get the best of both worlds, gaming and the sleekness of a Macbook. That being said, I have a 27" Thunderbolt display that I will be hooking the 15" up to and would prefer to run the Macbook with the lid closed while doing this. I have heard that some of the cooling comes through the keyboard. Is this correct? Would gaming with the lid closed be too dangerous as far as heat goes? I run my 13" this way all the time but of course I'm never gaming on it since the HD4000 can't really play many hardcore games. ---------- Also can a mod correct the typo in my thread title? It should say Gaming, not Gamin.