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Fan in Dell 8400

I had to replace a damaged case/cpu-fan in a Dell 8400 System. The fan Dell sent me was a "Nidec BETA V TA 350DC, 12V 2.3A".
I noticed that the fan had a 4-Pin Mainboard Adaptor (Dell 925X Board). 1 white wire (named MX), 1 red wire (named 7D), 1 black wire and a blue one. So far I have only seen 3-Pin Board Connectors.

Could anyone please help me to understand the idea behind this? What are the four pins good for? Just curious.


1 Solution
This might be wrong and if I'm wrong anyone is welcome to help me right in this regard.

Most of your previous fans had only three pins. Power, Ground and a sensor wire.

Newer fans and motherboards on the market have up to four pins. Power, Ground, Sensor and the new one for speed settings. The new LGA775 CPU's for instance have a CPU fan that is speed regulated according to heat sensed on the CPU and then sped up or down as required.
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