You're constantly posting wrong or exaggerated information.
Its 14% at 1080P, 9% at 1440P and 2% at 4K
https://www.techpowerup.com/reviews/AMD/R9_Fury_X/31.html
Al depends what reviews you look at , what settings and if you go by average or minimums. 20% slower at 1080p is about right Fter double check a few different reviews.