ok please help me to define which is better
http://www.flipkart.com/gigabyte-amd-ati-gv-r775oc-1gi-1-gb-gddr5-graphics-card/p/itmd7vspfutzzzbq?pid=GRCD7VQNQRTA5XN3&_l=LpihIjGRZ9rw90Gv7+AMrg--&_r=FBvj6zUcet8GNWkeMrh8eQ--&ref=d4bfc712-5466-4ca7-be90-0d7ca29a4a96
http://www.flipkart.com/powercolor-amd-ati-radeon-hd6750-1-gb-gddr5-graphics-card/p/itmd5ynerymtmfyf?pid=GRCD5YND3W72GXQC&_l=FXjQ11McQR5wWCGt4jHcog--&_r=aY_ptqUOFFpp2%203eze2wBQ--&ref=e624eb1d-e503-41c6-a228-940114412eea
http://www.flipkart.com/powercolor-amd-ati-radeon-hd6770-1-gb-gddr5-graphics-card/p/itmd5ynexrwfz4gw?pid=GRCD5YNDEHVGDPT7&_l=yy6FhXK5+eVh+C15NOEHKg--&_r=6maSEceQq75eTDqKYcVy8Q--&ref=acb75eca-9b3c-4907-ae9c-309ad30708e6
please
tell which is all ove better in all aspects
and which is better for gaming
rate them 1,2,3 (bcoz they are 3)