> In LM93 driver there is no such fan divisors > present.Is there any other way to solve the problem. Oh, you're right. It's quite rare to see fan monitoring chips without dividers, sorry I missed that. > Shall i get fan values by using 3 pin fan.It is > specified in the data sheet that 4th pin is needed to > get the fan values while using PWM. If the datasheet says you need 4-wire fans, and it doesn't work without it, then I guess you really need these. I believe these are rather news since I never heard about nor saw 4-wire fans so far. Sounds like a smart idea to allow PWM fan speed control while still reliably monitoring the fan speed (which is hardly the case with 3-wire fans). I cannot tell you more as I don't know the LM93 very well, nor do I know your specific motherboard. -- Jean Delvare http://khali.linux-fr.org/