I have been planning on getting a MacBook Pro with Retina display base model with 16GB of RAM as soon as in-store pick up becomes available. With the recent addition of extra processor options, I am a bit unsure of what the difference is between them. I did a comparison between all three here, http://processors.findthebest.com/compare/820-821-822/Intel-i7-3615QM-vs-Intel-i7-3720QM-vs-Intel-i7-3820QM but I am really only considering the 2.3GHz 3615QM and the 2.6GHz 3720QM. Other than the small clock speed difference, they seem pretty similar. In fact, the price of both chips are the same. This makes it seem rather silly to spend an extra $100 for a chip of the same price. The only other difference is the 2.3GHz 3615QM appears to be a physically smaller chip than the 2.6GHz 3720QM. That might explain why they both cost the same. My question is, will there be any benefit of getting the 2.6GHz 3720QM other than the slightly faster clock? Does the physical size of the chip make a difference, maybe in terms of cooling or logic board layout?