Hello guys, I was wondering who could explain me what is the difference between the i7 2,6Ghz and i7 2,9Ghz on the rMBP? I mean.. Will I really feel the difference? A friend of mine told me: "take the highest processor, this is the only thing you can't upgrade". I fully agree, but 380€ more, for 0,3Ghz.. Is it really necessary? Or should I go on citytrip with my gf? Thanks for explaining me Best regards!