Need help updating. (10.12.6 to 10.3.3)

Currently I’m running latest Sierra 10.12.6 but I want to update to high Sierra so what shall be done ?

My current config i7 6700k Asus Maximus VIII Ranger R9 390 sapphire nitro PNY 240ssd duel boot with windows (120gb /OS)

I’ve installed with MultiBeast, the drivers. Now the gpu seems to run at 30% power but it works !

submitted by /u/SURID10
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