What should you do? Just chill out.

Don't mess with the motherboard BIOS unless you need to. Wait until after the X2 chips are in use, and give it a few weeks to see if other folks run into problems -- maybe the update you've found is buggy because it's only been tested in lab situations. If your sytem is working now, then use it.

When the chips are out there, and other people have charged into the upgrade then they'll know de facto whether it's best to do the BIOS update before or after you swap CPUs.

--Nathan