Cpu Fan Error- Asus Sabertooth X79

[Dallascisco]

I recently built a machine using an Asus X79 Sabertooth board and Antec 1200 case. After connecting the large top mounted fan (3 pin) to a 4 pin fan connection on the board I am getting fan errors. I'm sure there must be a bios setting to regulate when errors are thrown but am not finding it.

 

[lsv]

Check for an option to change from PWM to DC, the 4th pin is for PWM control IIRC.