Good Evening, I've had an iMac for the past 5 years. I recently sold it in order to purchase either a MBA or MBP to have a more portable computing option. I'm not a very heavy user.... primary email, web browsing and Adobe Photoshop for a little graphics work I do. "Responsiveness" is important to me, I want to be able to turn on the machine and fire up apps quickly. After looking at the options between a MBA and MBP, I have one basic question about processors... please forgive my complete lack of technical knowledge around processors.... The MBA I am pondering has a 1.7GHz Dual-Core Intel Core i7, Turbo Boost up to 3.3GHz. The MBP I am looking at has a 2.8GHz Dual-core Intel Core i5, Turbo Boost up to 3.3GHz. Both of these processors "turbo boost" to 3.3 GHz, but have different "base" GHz. I have no idea what "turbo boost" means here..... In non-technical speak... is there any true difference between these two processors and is there any noticeable difference in their performance within their respective machines? Thank you for your input.