I plugged in a 3-pin fan into the 4-pin rear fan header of this board and the bios(ver. 0037) shows rapidly changing rpm reading under hardware monitor screen. I'm sure the fan is ok because it's new and working properly and its rpm showed up correctly when plugged into the 3-pin fan header of ASUS P4P800 SE board. I'm sure I plugged the fan correctly because of the guard thing on the pin. Is this a bios bug?