I have a M5a99x EVO R2.0, i also have a pair of corsair af 120s in the front of my case wired into the mobo. WHen I am in BIOS looking at the fan speeds one of them keeps spiking to 675,000 RPM. Obviously this is not correct and the fan seems to be running normal. I checked to see if the wire is cut and it doesnt appear to be. What could be causing this?