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

[colincliff]

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!

[arthurleung]

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.

[colincliff]

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

[Webby]

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

[Martin87]

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

[colincliff]

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

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.