What power supply in stock can run 5 280xs?!

I was looking at the 1600w Hercules thats the only available powersupply with high enough watts i can find, but everyone telling my the quality is bad.. i also seen on reddit someone using it to power on 6 280xs and hes doing it successfully.
so if i only do 5 will it work for a long time?

seeing as i wont be getting lepas because theyre sold out everywhere...

any help please