I just got a Samsung 990 1TB and in BIOS and in Disk management it doesn't show up. (And why I got a Gen 4 drive for a Gen 3 board is for a little future proofing) and yes BIOS is updated to the newest one (not beta)
Specs:
R5 5600
B450 Steel Legend
RX6600 8GB
Samsung 970 Evo 500gb
Samsung 990 1TB
WD Blue 2TB 7200RPM
WD Enterprise drive 5400RPM
Specs:
R5 5600
B450 Steel Legend
RX6600 8GB
Samsung 970 Evo 500gb
Samsung 990 1TB
WD Blue 2TB 7200RPM
WD Enterprise drive 5400RPM