9900GT does exists, just like 9900GTS and GTX, but they have the GT200 chip, and a friend of mine said that they changed the name to GTS250, and that the power of the 9900 GT is a better than the 9800 GTX. So, in this case, which is better again? lol
In that case, i'll buy the 4850. But I still have a question:
I used to own a (broken) 4850 that, besides being damaged, worked perfectly in my pc with a 420w psu, it never shutted down or something, just a bit more intense noise. But I've read that the 4850 requires at least a 450w... So, should I buy a new psu, even though the graphic card works well in my pc?
The 4850 draws 110 watts
Chances are you got a core2 duo or an athlon x2. Those draw between 70 and 100 watts.
Add in 50 for board ram fans and drives and you have a max system draw of around 250-300 watts.