Exact make and model of gpu.
Exact make and model of mobo
Exact make and model of gpus.
Do not do any more gpus. Until you answer the questions above.
Basically some psus suck.
And some gpus suck a lot of power.
to answer what i have:
the mobo is 5 gpu setup from gpushack.. gigabyte 970a-ds3p
psu is 1300w lightning and i have two HD7970's, two saphire r9 fury's, and one R9 280x.
nothing else really attached to the motherboard except for a solid state drive, keyboard, mouse, & monitor.