I'm still running Bios ver 1.80 and seemed to have overcome the driver clashes which plagued my Gig. HD7770C by using Driver Cleaner then reinstalling Catalyst 12.4.
The video driver may not be what you need but I just wanted to tell you that Bios Ver 1.80 that your chip is coming with seems pretty stable through many many reboots. Though the testing period has been very short. LOL
Hope the new chip gets you sorted because overall I'm delighted with the board and graphics card when the two work as advertised.