To my understanding you want some headroom for your PSU for spikes of power draw or moments like when large appliances start up. Ive certainly had psu’s as the cause of failures like that so it seems like it could be the case. Maybe you could get a 750w with return policy and try it out. Worse case you can just return it within that period!

This is the real answer. :(

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I wish life wasnt so pay to play. I just want to enjoy some of it.

How in the hell was anti-intellectualism ever framed as cool?