need help

hi my problem is with hashcat 4.2.1 and windows 10 64 bit with radeon 7990 with drivers 17.7.1 i'm get on wpa2 -m 2500 2232 h/s
and on hashcat 4.1.0 same system i get 273.7 kh/s
i test it with latest amd drivers 18.8.1 and same resultat
my layout is hashcat64.exe -b -m 2500 and also hashcat64.exe -b -m 2500 -w 3
and hashcat64.exe -b -m 2500 -w 3 -O


Thank you