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Originally Posted by MooseMan3000
My main point is that you end up spending more money on an SLI solution than simply getting a better graphics card. Even if you wait 3 years for the price of a 6800 Ultra to get down to $100, it still cost more in the long run than just getting a 7800 GTX in the first place. And you're still behind in performance. I just don't see it as an economical solution, no matter which way you look at it.
Take a look at my example from before. In the start, you pay roughly $600 for a motherboard with a single PCI-E x16 slot and a top of the line card. Or you could pay the same $600 for a motherboard that's SLI capable, and a graphics card that's not as powerful. In a few years, you buy another card.
No matter how cheap that second card is, you've already spent more money than you would have if you hadn't bought the SLI board, and you're performance still isn't as good as if you had simply gotten the better card to begin with. I'll say it again: A single card of the next generation always outperforms two current generation cards. Until it becomes possible to truly integrate two completely different cards, SLI simply isn't a cost effective upgrade solution.
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And I'll say it again, I don't agree based on the stats I've seen and posted. SLI 6800 GT/Ultra is not in general outperformed by a single 7800 GTX, and it would be cheaper to add another 6800 series if you already had one than to replace it with a GTX. Now since the motherboard is more expensive in the first place, it's even closer, but I still don't think SLI can be that easily ruled out.