What psu? Rx580 8gb R5 1400 oc

Jul 8, 2018
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What psu should I get? And please one that is cheap(under £50):
System: RX580 8gb ryzen1400(plan to oc at 3.8GHz at sub 1.4v) 2x4gb 2666mhz 2tb hdd win10 64 3x 120mm fans micro atx ab350m
A corsair cx450? Evga b1? Any suggestions ?