No, first thing is reducing voltage. No need to edit bios for that.
Thanks man!, I undervolted the gpus core form 1150mV to 950mV, now it is running stable at 700w according to my kill-a-watt
As a rule of thumb never use GPUZ to save roms. Use the bios flashing utility itself.
Good to know, thanks.
And psu can now handle the load.
as a rule of thumb 60% on an atx works well 24/7/365. and 1300 x .60 = 680 watts.