I was wondering if a 600w psu is enough to overclock an i5 4690k and an r9 280x and also if the Antec True Power Classic 650w 80 Plus Gold is a good power supply ( http://www.amazon.co.uk/Antec-True-Power-650W-Supply/dp/B00HGFYGOS/ref=sr_1_2?ie=UTF8&qid=1427223797&sr=8-2&keywords=650w+psu )