Well, the parts they use are about 1-2 years out of date. They then want an extra £700 for 4GB of RAM and 1GB of Vram per card. That, on a custom built computer may JUST about set you back £200, if you buy the first thing you see. Oh yes, and the parts themselves (minus the pretentious looking case and incapable power supply) would come out at not even half that price. Hold on, I'm going on PCPartPicker. Just a few notes. The 4930k is more powerful than Apple's E5 Xeon. http://pcpartpicker.com/p/2mMs6 This. Will. DESTROY the Mac Pro. More upgradable. Probably quieter. More powerful. More efficient. Better looking. Better warranties. Better range of software.