I am working with this mobo and I am not sure about bios control on this as I am using the SIV program, but the question is probably about using both ways. I have a 3 pin fan on it currently so it is not pwm. Is it normal that the mobo cannot control the fan speed of a 3 pin fan using the cpu fan header? It runs 100% all of the time no matter how I set the bios or the SIV controls. I swapped over to the system fan header and can then control it in SIV. And if this is normal is it typical for other giga mobos? I normally have 4 pin cpu fans but I would like to know in case I run into some kind of situation like this again. Thanks for any info.