+1^ Completely agree with Eduello, a new PSU is the way to go. Otherwise you could fry the lot, with a poor PSU.
any decent XFX 550w psu like this one will suffice :https://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9
the I5 3570k is still a beast, so if your gonna get it, go for a z77top end z75 board to compliment, cos your gonna wanna OC that baby at some point. No point in hindering it with a Hxx/Bxx mobo.