Oh yeah, 1+8 method right. 
But may OP card still under warranty, better didn't do physical tweak.
But may OP card still under warranty, better didn't do physical tweak.
This method used jumper method, connecting a foot IC chip number one and eight. Number one is the one under a small hole in the IC. And number eight is at the opposite end of the number one when we draw a slash of the number one.
one question, Is the jumper should be connected when powering up GPU? I have one dead RX480 reference card and will probably try this out