Same GPU for SLi?

[Dwarfer]

Hello I want to go SLi, I have a gforce 7800GT EVGA (IT DOESNT SAY OC VERSION SO IM GUESSING IT ISNT)

My question is, can I stick any old gforce SLI compatible gpu in there, or does it have to be the same make, moddel to work?

Thanks I need to know before buying

 

[Addis]

With SLI, both cards need to be the same model, and often from the same vendor, e.g. 2 EVGA 6600GT cards. To be honest, I wouldn't go for SLI right now, since you'll need another high end card which will be very expensive. You may want to wait a while, and buy it for SLI when the card's cheaper.

ATi's Crossfire allows two different models to be run.