is there a large diffrence in performance between these two parts?\
n515: http://www.newegg.com/Product/Product.asp?Item=N82E16814130247
n516:
http://www.newegg.com/Product/Product.asp?Item=N82E16814130256
n515: http://www.newegg.com/Product/Product.asp?Item=N82E16814130247
n516:
http://www.newegg.com/Product/Product.asp?Item=N82E16814130256