I did a last minute upgrade on GPU and ended up with higher total wattage than I had planned for. Everything was already purchased except my GPU. I'm at projected 423 watts with a 500 watt PSU (corsair CX). Cause for concern or do I have enough headroom to sleep easy at night? : )
No problem at all, i run a R9 290 and an i5 3570k on a 480W PSU.
~~Though, the CX seems to offer only 2 6pin and the gpu needs an 8 and a 6pin power plug. Considering im not a fan of molex to what ever adapters, i would recommend getting a PSU with 2 6+2pin power plugs.~~