hd 6670 is way faster than gt 630.it is around 30%faster.gt 630 has 4gb vram which is full waste of resources,forget that crap.
dude why getting 2gb gpu is not at all usefull.1gb is more than enough.i suggest get hd 6670 1gb ddr5 as ddr5 is way faster than ddr3
+1 from me. How much memory graphics cards have is one of the least important factors in gaming, as long as you have 1gb, at this price point, you won't have any problems. If you can, try getting a 7750 with 1gb ddr5, because it should be around the same price but a lot better.