Mac is it worth it? in Nerd's Chatter [/nerds] Posted January 16, 2011 They handle it with well designed heatpiping, speed throttling and variable speed fans. This is the same thing other manufacturers do to get the i7 into laptops and other small form factor devices. To be honest, it's not much of a challenge to cool. I'm sure the old G5 iMacs were much more difficult to engineer since the processor ran so hot they couldn't even use it in their laptop line. Those 90nm PowerPC CPU's, that would obviously generate more heat then the i7 45nm & 32nm, but those generate more heat then AMD Phenom II x6 45nm. I'm assuming Apple only uses one cooling solution per model and as such it is probably designed to meet the thermal threshold of the highest CPU option offered in that model. I haven't heard of overclocking on a Mac before though since they use an EFI instead of a conventional BIOS. It may be possible with third-party utilities and if it is, you could probably do some slight overclocking on one of the lower CPU options. I wouldn't try it on the highest CPU they offer in that model though as it would probably exceed the cooler's capabilities. I heard most of the third-party utilities were available on windows, is that true? So it theoretically so no over-clocking potential on the highest CPU? Anyway, it's cost around £1,000 to build a PC that can easily outperforms the Mac Pro's 8 core option in many areas which is exactly £2,859, the examples PC specification are AMD Phenom II x6 1090t, oc to 3.8Ghz, H50 water cooler, 8GB DDR2-800 RAM (Corsair XMS), ATI Radeon HD6970, 2TB Seagate Hard drive and a 1000w cooler master power supply.