Okay follow these steps (this was found in your Motherboards manual),
Go into bios (pressing DEL on boot repeatedly),
Click on M.I.T. Tab,
Enter "PC Health Status",
Scroll down to "1st System Fan Speed Control" and press enter,
Scroll to "Full Speed" or "Manual" and press enter (if full speed skip next 2 steps),
Now select "Fan Speed Percentage" directly below "1st System Fan Speed Control" and press enter,
Set percentage to 100% (use +- keys maybe),
Press F10,
Select save and quit.
Test!
Let me know how it works. If full speed mode does not work try manual and 100%. Good luck