Question about Connecting Heatsink fan to Motherboard

[revanrules]

I just noticed that the stock heatsink for my e6750 takes four pins and there is a place on my mother board thats labeled cpu fan with four pins. I'm going to install a Thermalright Ultima 90 with a Panaflo Fan on it, but the panaflo fan takes only three pins. Can i just plug it into a different fan header on the motherboard with out any problems? or is there a different type of fan that would be better to use on the heat sink?

 

[Navid]

You must be able to connect a fan with a 3-pin connector to your 4-pin header. The 3 pins are usually identified.
http://www.intel.com/support/m...esktop/sb/img/4pin.jpg

 

[revanrules]

so what is the fourth pin for?

 

[Navid]

Originally posted by: revanrules
so what is the fourth pin for?

The forth pin is for controlling the speed of the fan using pulse width modulation (PWM).

Read the BIOS settings on page 42 (Fan Speed Control Mode) of this typical motherboard manual for an example.
http://america.giga-byte.com/F...nual_ga-965p-ds3_e.pdf