Hi, I'm still contemplating on which model to buy. As far as researching is concerned, I've narrowed down on the following models: 1) early 2013 macbook retina: 2.7ghz 16gb ram 512ssd 650m 2) late 2013 macbook retina: 2.3ghz 16gb ram 512ssd 750m 3) 2) with 2.6ghz upgrade I've gave up on the pc gaming laptop for various reasons: build quality, crappy display, weight. (But better price and performance) My questions are as follow: 1) I mainly play WoW, SC2, D3. Do these games require cpu power for me to upgrade cpu? 2) since heat and noise will go together, do higher clock cpu produce more heat&noise noticeably? (More than 10celcius and etc) 3) do 650m lack more than 5~10fps than 750m under same settings? I've looked up on barefeats and other benchmark sites but couldn't find a clear answer. Any real life users' comments will be greatly appreciated. Thanks.