The PSU should be a EVGA or CORSAIR 1200 watt , fully modular and Platinum rated like the Hx1200 from Corsair, this PSU can keep up 5 cards even if they are running near 200 watt but that is not the case because when you are mining Ethereum they are consuming 135 watt each from GPU-Z or MSI afterburner app.
What you see in the afterburner app or gpuz ,that is not your vga card power consumption ! That is how much power your GPU using on the graphics card !
So if your gpuz reading is 135 watts , that card easy can pull anywhere from 150 to 250 watts , if you did not properly undervolted/underclocked fine tuned your cards. This is sometimes really hard for newbies
