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Undervolt the card to boot
Reduce the power to the GPU
I know until 2 years ago, we were all like Clarkson "MORE POWERRRRRRR". That's not the case with AMD since Vega
Had a little test earlier, and a little panic too. I tested around 1040-1020mV range. I seemed to get a highest 8950 score around 1038mV (which I then failed to get again). I started to try and go a bit lower with a load of fails, then tried to go back to 1038, during this test the screen went green and properly spazzed out. At this point I got scared and wussed back to your settings againGo back a page to post number 74 and read the following few posts
https://forums.overclockers.co.uk/posts/33079300/