these two xfx 5870s have the same specs and the same cost, but both newegg and the xfx website mark them as different models. whats the difference?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150476&cm_re=xfx_5870-_-14-150-476-_-Product
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150490&cm_re=xfx_5870-_-14-150-490-_-Product
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150476&cm_re=xfx_5870-_-14-150-476-_-Product
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150490&cm_re=xfx_5870-_-14-150-490-_-Product