So I decided to get a new gpu to replace my shitty HD 7770 I made my choice and I am getting R9 380 4gb or 2gb (I need help of which version to get) I have FX 6300 CPU (Will it bottleneck). and would Corsair 600CX be enough for this build if not which PSU should I get. I have 8gb ram and 500 gb hdd