So I have a mid-2012 MacBook Air. 11", 128GB SSD, 4GB RAM, blah blah blah Anyways, it has 2 USB ports (1 on either side of the laptop). Are they both USB 3.0, or is just one of them? If so, which? Also, when I upgrade to Yosemite, will these USB chargers charge my phone faster than they do now? I have heard that they will and will charge faster than the 5W iPhone chargers and will be more comparable to the 12W iPad chargers. Is this true?