@Alan, am quite aware of what runs where on a computer, even if you overclock, the OS has to run the apps. When I make postings here, its under the assumption that the reader already knows where and how the overclocking is done. Can a MAC be overclocked? Infact, with the new machines, the HDD and battery is built into the case. What will you then access? Firewire 800 in a daisy chain config?  I also don't hear you whining about the price comparison either, especially on hardware. :-)