Can I convert a three pin case fan to a four pin?

I have just replaced my motherboard. My new mobo has a four pin case fan header whereas the old one had a three pin one with a three pin fan.

I can connect the three pin fan to the motherboard but it means that i have lost the speed adjustment from the fan as the motherboard uses the fourth pin to control the speed.

Is there anyway i can convert the fan to use the four pin controls? The case fan is built for the case so i dont think i can buy a four pin version.

Edit: i dont mean a four pin molex power, i mean the four pin mobo header incase there is any confusion!

What motherboard are you using? Most motherboards have the option of selecting between PWM (4pin) and Voltage (3pin) mode fan speed control.

And I believe there might a special chip within a 4-pin fan which allow the motherboard to control the fan, which a 3-pin fan wouldn't have.

The motherboard i am using is a GA-G33M-DS2R. Would the option for fan control be in the bios?

You can set the smart fan control to use voltage rather than PWM (in the BIOS) although it should be alright set on auto...

would it not be easier just to buy a new fan?

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Originally Posted by Martin87

would it not be easier just to buy a new fan?

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the seems not to be a normal size, designed for the case i think. it does not screw in on the fourt corners but has a bracket on one of the ends that fixes it to the case.

I havn't seen a replacement the same as it.