I've just bought a new CPU cooler, and discovered that it has the new 4-pin plug on the end (it calls it a PWM plug). Seeing as the extra pin is for speed control and the other 3 are the same as before, would it be ok to plug the end into a 3-pin socket on the motherboard, and ignore the extra pin?
If it helps, the cooler is a Akasa AK-876.