What is the best gpu out of these voltage does not matter.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151138
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139055
http://www.newegg.com/Product/Product.aspx?Item=N82E16817116030
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151138
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139055
http://www.newegg.com/Product/Product.aspx?Item=N82E16817116030