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Why Do I have a 3 pin connector on my rear Case Fan???

C

Caveman

Platinum Member
Front 120 mm fan uses beffy 4 pin... Rear 120 mmm uses small 3 pin ... Is the small connector supposed to be plugged into my MoBo?

The front 120 actually has 2 connectors: 1 4 pin female and 1 4 pin male? Why???
 
Originally posted by: Caveman
Front 120 mm fan uses beffy 4 pin... Rear 120 mmm uses small 3 pin ... Is the small connector supposed to be plugged into my MoBo?
- mine is. i have 2 connectors on the motherboard, one for a power fan and one for a chassis fan...
The front 120 actually has 2 connectors: 1 4 pin female and 1 4 pin male? Why???
- i think this is so you can power another device or fan and not waste the entire lead's power on 1 case fan. although my 80mm front fan is set up the same way 🙂
Click to expand...
 
"Is the small connector supposed to be plugged into my MoBo? "

Yes, unless you have a 4-pin molex to 3 pin dongle.
 
The third pin on the fan is for speed sensor. Plug them into fan connectors on motherboard, and system can monitor fan speed, if you get a 4-pin lead from PSU to 3=pin adapter, fan will work, but speed will not be reported.
 
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