HD 6670- Entry level card, pretty bad at gaming with 1080p. I had the HD 5670 with GDDR5 and it played games @1600x900 with medium settings and they were just above 30 fps but below 40 fps.
Also please specify your resolution and budget. Generally a good card for 1080p would be the HD 7850 which should not break the bank.http://www.newegg.ca/Product/Product.aspx?Item=N82E16814150617
EDIT: Forgot to mention but this isn't really an overclocking question, should have posted this in the grahpics card section. Either way since you have posted it I guess I can help