Which would be better in xfire:
Gigabyte 6850
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125353
or
Sapphire Toxic 6850
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102912
or
Powercooler PCS+
http://www.newegg.com/Product/Product.aspx?Item=N82E16814131379
Gigabyte 6850
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125353
or
Sapphire Toxic 6850
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102912
or
Powercooler PCS+
http://www.newegg.com/Product/Product.aspx?Item=N82E16814131379