"Six years ago, loading a true enthusiast machine down with all the hardware you could muster meant that you were pulling no more than 600W-700W, and finding a power supply to handle that kind of load was nearly impossible. Since then we've seen a huge change in the hardware that enthusiasts utilize in their rigs. SLI brought about multi-GPU systems that required more power than ever.
While you have your selection of vendors for motherboards, memory, storage, and more, finding a power supply to fit the bill of such a machine produces few options. The last 12-18 months have brought some more selections, such as the Corsair Professional Series AX1200 that we are taking a look at today. The AX1200 is Corsair's flagship power supply. It is the biggest, meanest beast that they offer."