I've been doing some research and I've been getting a lot of mixed advice. I am planning on getting an r9 390 GPU and an i5-4460 3.2GHz Quad-Core Processor. In my current build I'm buying a EVGA 600B 600W for my power source. Is this enough power for my current build or do I need a better PSU? I do not plan on overclocking. here is my full build: http://uk.pcpartpicker.com/p/khRxwP