What now? 1 day left?

So just reviewing my little countdown timer, about 1 day and 2 hours left until I can finally get GTAIV. This is about the time that doubts starts to settle in, as with all gamers. Although I don't mean to bore you, I just want to get this off my chest. The game information states that the minimum requirements for a certain video card is a Nvidia 7900, but my computer is a 7600GS. Frantically, I've been looking through to see if that version is compatible, and apparently it is. This however got me hell confused. What's the difference? Well, I'll be glad I'll be getting the game and all, and I can't fucking wait. I'm just wondering though, what situation will I be in if the game does not work. I'm stressing over the possibility that my computer may not be strong enough, or even that the even of a "Fatal System Error" occurs while attempting to play the game. I should probably give it a rest, but I can't help by fuss over it. I only PRAY that things work out in the end.