I understand that the CPU_Fan and the CPU_opt is linked together but i have my Corsair H80I plugged into my CPU_Fan header and i have a Corsair DC Fan plugged into my CPU_opt header, is there anyway to make the mother board realise that the CPU_opt is a standard fan and doesn't need to be on full RPM? I have tried changing the settings in the BIOS but i just get CPU FAN ERROR if i put the CPU_opt setting to either DC or Auto.