sieedhassan :
Muku :
Whats your max budget and what games are you planning to play? without that its very hard to recommend anything.
100$ Max, No specefic games... whatever game i can play with this system, my main concern is to watch 3d movies.
If you are from US then the best you can get for 100 dollars is this:
http://pcpartpicker.com/part/asus-video-card-hd7770dc1gd5v2
http://www.asus.com/Graphics_Cards/HD7770DC1GD5V2/#overview
HD 7770 is superior to both GT 610 and HD 6570. Its the best card for entry level gamers. You will be able to play all the latest games at medium-high settings up to HD resolution and can also watch 3d movies easily. Anything below this is a waste of money in terms of price to performance ratio.
The card needs very less power. A good quality 400 Watts PSU is more than enough to run this card, provided you are not overclocking the card.
However if you are from a different country then the price will vary..