I have 5 imacs and 3 mac pros in our studio. The asus pc we just built rips the current mac pro 12 core to shreds. We have 12 cores over clocked to 4.2 ghz/ 2 gtx580 cards with 3gb ddr5,10,000 rpm raid 0 hardrive for scratch and 512 ssd for apps. We have corsair liquid cooling and 64 gigs of ram. This system runs the sandy bridge e i7 chipset which is not available on mac yet. It costs about half the price as mac, and as a business this makes a lot of sense.