I'm going nuts. What is the SB_Fan1 header for? I finally found out that PWR_Fan1 header means fan will always run at 100% (be nice if the mobo manual mentioned that), but i can't for the life of me figure out what SB designates! Al it mentions in the manual is "SB_Fan1 supports Quiet FAN". Near as i can tell that is a CPU fan feature, which I assumed would be controlled by the CPU_Fan1 header. What am I missing!?