Double checked that also no “TdrLevel” is set here ( HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers ) ?
( or if it exist, it is on “3” )
The resolution should be fine for DLSS.
BIOS update… yes… may be… but I assume if the BIOS is not years old, it should not have an impact ( in constrast to e.g. resizebar )