IBT AVX from the Vishera thread doesn't work here either on mine 3800X, though another google search for a download of IBT(official?) does work though that version I only get 110GFlops.
I remember getting 180Gflops on IBT AVX on Ryzen 7 1700 @ 4.0Ghz.
Seems the software needs updating as there seems to be some incompatibility with Ryzen 3000 series for IBT AVX. It's a unofficial AVX mod right for AMD?
Gigabyte X570 AORUS XTREME, Ryzen 7 3800X PBO boost, 2x8GB 4866/1900 18.104.22.168.90.tRFC 680 1T 1.650V [Micron Rev.J]
4x8GB 3800/1900 22.214.171.124.66.tRFC 600 1T 1.700V Kingston HX434C19FB2K2/16 3466C19 1.2V (Micron Rev.E 19nm [D9VPP]),
2x8GB Kingston HX436C17FB3K2/16 3600C17 1.35V (Micron Rev.J 17nm),
2x8GB 3866/1933 126.96.36.199.60.tRFC 448 1T 1.590V Kingston HX436C17FB3K2/16 3600C17 1.35V (Hynix DJR 17nm)