Hello,
I want to buy new graphic card, in my last thread I saw some comments about hd6670, 6770, and gtx550
Which will be the best choose for my computer?
What resolution and games are you planning on playing?
What are your power supply specs (12v amperage rating is more important than total wattage)
What is your price range?
6770 and 550 Ti are pretty comparable in performance, the 550 may be a tad bit faster, but you probably couldn't tell back to back. These are pretty good budget card for lower res gaming at 1650x, especially if you don't mind playing without too much anti-aliasing. 1920x really wants a higher spec card, but I'm using a 5770 right now for 1920x gaming until the new generation of cards hits. I have to turn down settings from maximum and no anti-aliasing to get decent performance.
GTX560 is about equal in performance to a 6870, which offers
plenty of horsepower for 1650x at full options, and will play at 1920x with almost everything enabled on less demanding games, but may need just a step or too down to be completely smooth on the most demanding games (BF3, for example.)
6850 offers a middle step, where the nVidia competitor is the GTX460 1GB.
I really wouldn't consider cards below a 6770 / 550 Ti. Lower spec than this cut speed in huge chunks. A 6670 is slightly faster than HALF a 6770, but price is still 3/4 for example.