Whats the difference between these three cards, and which one is the best?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130826
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=evga+660&N=-1&isNodeId=1
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130825
Is the SC worth the extra 15$. I'm buying this for a friend.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130826
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=evga+660&N=-1&isNodeId=1
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130825
Is the SC worth the extra 15$. I'm buying this for a friend.