What is the difference between those two graphic cards.
http://www.msi.com/product/vga/N6602GD5OC.html#/?div=Overview
http://www.msi.com/product/vga/N660_TF_2GD5OC.html
http://www.msi.com/product/vga/N6602GD5OC.html#/?div=Overview
http://www.msi.com/product/vga/N660_TF_2GD5OC.html