I realize they must the same card, but do they have to be completely identical? I.E. can I SLI a 7300GT 128ddr2 with a 7300GT 256ddr3? Or would that even be worth it? Needless to say my 7300GT 128ddr2 isn't living up to expectations, and I'm debating on whether or not to try SLI with another one or just trash it and go for a better card.