I own a 990FXA-UD3 board and i had to do a BIOS update to run my 8120. Granted that was a while ago, so i assume it should ship with an updated BIOS for the Vishera chips. Even if it's not, they make it super easy to update it. I just threw in the old chip again, put the BIOS on a flash drive and the utility does the rest.
Btw, the F9 BIOS is the BIOS that supports both the Bulldozer and Vishera chips, use CPU-Z and see if you already have it.