I will buy gaming pc soon. Parts that I will buy: CPU: FX-6300; GPU: R9 380 4GB(OC version); MB: MSI 970 Gaming. I will overclock FX-6300 to ~4.5GHz. I will buy 'tier 2' power supply for my PC, because 'tier 1' power supplies are too expensive for me(I'm looking for 50-65EU PSU). And should i get 550W or 600W PSU?