i am confused


They're both low end cards, I could go for the 6670 if I had to though.
 
6670 is better than 630. Make sure you buy gddr5 memory one. It is low end card but it can do many things. If you can I would go higher to 7750. Oh and are you buying new computer or upgrading? Tell your other specs. List the links of that cards youre buying.

Hope it helps!