I did a PSU calculator and with all my gear to include lights etc (which I don't use and turn off), my wattage requirements come out to about 300W.
So I think I have plenty of headroom on the PSU. I'm returning my burned out graphics card for replacement. I'm debating whether or not to replace the PSU. The voltages appear ok under idle.
I have no way to test under load as the graphics card is dead.