Will a 550w Corsair PSU be enough for this build?

Detevtive Marvel

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Jan 16, 2016
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I have it already and here are the specs;

GPU - Asus Strix GTX 970 4gb
CPU - i5 4460
Ram - 8gb (1 stick)
Motherboard - Asus H81m-Plus
and 4 case fans

Will 550w do? If not will using a GTX 960 make a difference?

Thanks