Originally Posted by Fixit7
I got the wrong fan. It is one for cooling the computer chassis instead of the cpu.
The new one has a 4 wire connector while the old is 3 wire.
Can I use the new one in place of the 3 wire fan for the chassis fan ?
Could be taken various ways (are you going to use the new fan on the CPU or are you going to use it as a case fan?)
But replacing a 3 wire fan with a 4 wire fan is not normally an issue. Though there can be issues with some non-stardard fan wiring used on some big corporate systems (e.g. dell)
Originally Posted by Drakeo
yes you can if it plugs in ok and the ground and power is right test it. the fourth wire is for the control sensor it will slow it down and speed it up for quite operating. you will have one speed.
Most 4 wire fans are 'PWM' fans. The 3rd pin is the speed sensor, 4th pin is for the PWM function. Fan speed can still be controled by changing input voltage.