Sure, more speed is great, but on OS X most bumps don't have an appreciable effect on everyday work (unless all you're doing is video encoding). We were more interested in what Intel's Penryn processors can do for the MBP's heat envelope, so we maxed out both CPU cores in this brand new machine at let 'em crank for a half an hour. Our test machine may or may not compare to a later 3rd-gen MBP in terms of heat efficiency, but here's the quick rundown: Core Duo (2.16GHz) Peak: 195° F, fans over 5000 RPM Average: 185° F, fans about 4900 RPM Enclosure (bottom): very hot to the touch Enclosure (top): fairly hot to the touch Penryn Core 2 Duo (2.5GHz) Peak: 176° F, fans ...