Have a look in the pictures in this thread over at x86project. It shows the Intel EFI utility running. In it it clearly says "Genuine Intel(R) CPU 1500 @ 2.00GHz". ????? Thread link: http://forum.osx86project.org/index.php?showtopic=6956&st=260 Spanky Edit: There is a 1.5Ghz Yonah Dual Core Chip, its a low-voltage one (i.e. a good one for default overclocking): The 2.0Ghz Dual Core Yonah part costs $423 btw. Maybe this is how Apple are making their money and keeping the same kind of profit on their iMacs as they did with PowerPC chips? CPU Prices source: http://labs.pcw.co.uk/2006/01/intels_new_cpus.html Edit 2: Its perfectly reasonable to expect mobile chips to be overclocked when in use in a desktop since the P-M line of chips has always been easily overclockable on air. Just check over in the Xtreme Systems Forums to see what's been done in the past. I'm guessing the chip in the MacBook Pro will not be an overclocked part though.