The Opteron 252 is an old model server chip. It would be interesting to see if you could even find one.
What you want is a modern desktop chip. Like one of the ones listed on the motherboard's CPU support list. http://www.gigabyte.us/products/product-page.aspx?pid=3967#
The newest processors are at the top of the page. Just pick the best one that the budget allows. Once you've selected one, you can post back if you need further assistance.