Did you require any bios update?
No, but mine was already on the latest BIOS version (2009) when I got the PC. You should definitely flash to the latest version of your motherboard's BIOS before any upgrades, however.
If worst comes to worst, give American Megatrends a call and see what their latest BIOS is for that motherboard. They'll probably shunt you to someone who knows what they're talking about, and then you can ask about compatibility with recent video cards.