AMD making octacore CPUs to battle Intel's quadcore offerings - and still just playing catch-up. As far as that's concerned, go with Intel. Also, 850W might be a bit of an overkill, the 4770K has a TDP of 84W, minimum recommended for the 780 is 600W - on NVIDIA's site anyway, if OC'd or some such, the manufacturer might recommend higher, but for comparison's sake, I've an OC'd 760 (base is 500W) and a Q9550 (95W) - perfectly fine with a 650W PSU here. Again, if you wanna do serious overclocking on your own or have unusually many other components, might be needed, but if you're just gonna run your system as it is, 750W should be enough and you save a couple bucks there too.