When you first install a new motherboard, normally the post screen will tell you to press an "f" key to enter the bios. You may find a hardware management section with a setting such as "smartfan". If you do, you can calibrate the fan and set it to auto but I use "quiet" if it's available. If you prefer lower temps, don't use the quiet setting. You can also check and change the boot order, then save and exit. Some oem boards by dell or hp won't come with a fan setting control in the bios, but they tend to run fairly quiet at the default setting. If you don't like it, you can install one of these manual fan controllers:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835118217...