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 4.4Ghz, 4266/1900 MEM/FCLK, 22.214.171.124.73.tRFC 650 1T 1.45V
4x8Gb Kingston HX434C19FB2K2/16 3466C19 1.2V (Micron E-die 16nm)
OLD: Biostar x470GT8 Ryzen 7 1700 @ ~4.0Ghz CPU, 3200Mhz RAM ...