Hi Sugar.
If you have AMD build up and have FM2 CPU like A10 5800k or A8 3870k @ INTEL like i3 or i5. ARE YOU?
Then you will get a SWEET 7750 from sapphire (bit cooler) or power color (bit cheaper) to which you would prefer. A 7770 would
better if your mother board and power-supply has the capacity. But for me A 7750 is enough. Try check if your Psu or Mother suites.
http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1159&pid=1501&psn=&lid=1&leg=0#