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Originally Posted by Sty
As pointed before, today it's not feasible to go for SLI configuration since the next generation card is considerably faster. Buying an older second card will cost you more than just ditching the old card and getting a new one. So SLI is only suitable if you're going to pluck dual cards in initially.
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I don't
entirely agree with that. I think right now if I had one 6800 GT/Ultra and an SLI motherboard and wanted better performance, I would buy another rather than replace it with a 7800 GT/GTX, save some money and end up with comparable or better performance. It might not be a huge savings to do the SLI upgrade, but I think with the current and last generation it turns out to be a wash or better, and we can't really speculate at this point about the price or performance of the next generation compared to this.
I did find
some benchmarks showing a larger benefit of a GTX over GT than I orginally thought, especially at extremely high resolution (2048x1536), but I'm still not sure I'd pay the premium for it. At 1600x1200 they also seem to show Ultra SLI being comparable to a 7800 GTX and better than a GT, and in Doom 3 the SLI considerably better than either. In
these, the GT/GTX difference isn't as large, probably because of their lower test resolutions. The bottom line is you need to do a lot of research if you really want to end up with the best performance for the least money, and the best for one person isn't the best for another due to differences in what and how we play.