how to add aditional fan in chasis if your mobo has only 2?

[OdaNobunaga]

my chasis is a thermal take v3 black wich can use 4 fans but my motherboard has 2 slot for 4pin fans.
how can i add more fan if that was the case?

 

[olafgarten]

You can get Molex adapters to connect directly to your PSU, but it will run at full speed, I would recommend a fan controller.

 

[pauls3743]

If you want to install 4-pin fans you could go down the road of a pwm distribution board. This will distribute power and the pwm signal to all the connected fans as it's powered by the power supply but controlled by your motherboard. With pwm the fan controller is built into the fan and the 4th pin tells it what speed it needs to run at.

http://www.kustompcs.co.uk/acatalog/info_9664.html

If you want to go for 3-pin fans you're looking at a fan controller as the fan speed is controlled by the +12V supply to the fan.