Makers of 290s recommend 700+ Watt power supplies. They do that for a reason.
And yet still hasn't learned to look up simple facts online.FYI: I have been in IT professionally since the late 1970s, probably about the time your parents were born.
Peak power consumption of the whole system is 440W.
And that's measured from the wall - AC current. Power supplies are rated with DC current, 440W from the wall translates to around 400W PSU requirement.