I can't modify the overclock settings of my RX 6600 with PhoenixMiner 5.9b in windows.

Using AMD driver 21.11.2.

It's my oc settings:

-fanmin 50 -fanmax 50 -mclock 945 -cvddc 735 -mvddc 1150 -cclock 900 -amd

But nothing changed.

What should I do?   

System:

Windows 10 20H2
B85 / G1840 / 4G RAM
MSI MECH RX 6600 x 8  (Every card can work)
AMD driver 21.11.2

Thanks.