How many Led Cooling Fans r possible to connect with motherboard? (i mean all with sensors!)
I have EpoX motherboard with 3 X 3Pins Fan Connectors (with sensor), so my question is.... can i connect more then 3 and how many is possible with sensors?

Could you define sensor for me? Speed control?
You are only limited by your PSU (power supply unit).
You can use this Power Calculator (http://www.extreme.outervision.com/index.jsp)(thnx DonNagual) to determine how many.
You can get led fans that have molex adaptors.
You can also splice them together.

Is this a mod or intended more for cooling?

G'Luck