What is the difference between these two cards?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121803
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121805
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121803
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121805