Wouldn't the overall difference in speed be .54 and not .27? since we are looking at the dual processors at a whole? I am still deciding on whether or not I should get a 2.93ghz over the 2.66ghz. I am a fulltime graphic designer and use my computer everyday for work. The apps I use mostly are photoshop cs4, indesign, illustrator, aperture, office 08, ilife 09, iwork 09. I use my computer to do practically everything. Internet, watch movies, encode video, video editing, etc. Was wondering if the difference of .54mhz make a noticeable difference when using like photoshop, applying filters, and also making adjustments to RAW files in aperture? I had a 2.53ghz 15" unibody MBP recently and notice that even with that model it chokes in aperture when making certain adjustments to RAW files. And since the 17" is a bigger machine meaning more pixels on the screen, wouldn't it require more power to push all those extra pixels? I really need some professional opinions before I take the plunge and order my 17" mbp. Real proof of actual speed diff between the 2 model using real world applications and uses will help me better make my decision.