Download tools:

ATIWinflash: https://www.techpowerup.com/download/...
PolarisBiosEditor: https://github.com/jaschaknack/Polari...
atikmdag-patcher: https://www.monitortests.com/forum/Th...
MSI Afterburner: http://download.msi.com/uti_exe/vga/M...
GPU-Z: https://www.techpowerup.com/gpuz/
HWiNFO64: https://www.hwinfo.com/download.php

use afterburner BETA 16 within settings make sure Unlock voltage control is ticked and next to it select third party, that's if you use claymore for undervolting.