New BIOS (released 27.02.09):

GA-EX58-Extreme - F6c
GA-EX58-UD5 - F6b
GA-EX58-UD4P - F7c
GA-EX58-UD3R - F5c
GA-EX58-DS4 - F6b

Fix cold start (QPI / Vtt bigger than 1.280V)