So I'm going to upgrade my GPU, and I saw the Sapphire R9 290 Tri X OC at a steal 230€ of a price (I currently have a GTX 660) and I have an XFX 850W Black Edition 80+ Gold PSU, and seeing the review of the 290 on Anandtech OC'd it consumed 500W in furmark, so is my 850W good enough for an 8350 aswell OC'd to 4.6Ghz?