orihS ‪‪‪Shiro;1778021 said:A 500w Seasonic PSU is like a 700-800w PSU from a lesser brand.
I agree completely. But a 500 watt unit is still just 500 watts. When they say a minimun of 500 watts they mean from a reliable 500 watt unit and it's the minimun for stable operation. If there's the slightest chance you may upgrade in the future you should get a bigger unit, otherwise you should be fine