What is the difference between these two products?
http://www.newegg.com/Product/Product.aspx?item=N82E16820147466
http://www.newegg.com/Product/Product.aspx?Item=9SIA12K4871041
http://www.newegg.com/Product/Product.aspx?item=N82E16820147466
http://www.newegg.com/Product/Product.aspx?Item=9SIA12K4871041