The only time SLI would be worth it is if you were getting some very high end cards. If you were looking to spend $500 then two 8800GTs would outperform a 8800 ultra at a simular price. But also you would need an SLI MOBO, and power supply which will really raise the cost. Other than that I see it as more than a marketing gimic then anything else. They are always improving on it though.
The higher the resolution you are gaming at the greater the benefit of SLI/crossfire. If you are playing at low resolutions you notice next to no difference at all.
hmm very interesting to know, so in the long run it would just be better to get a single card if it was better than two cards in SLi?
Not in the PC world, more is always better. However the performance gains you'll see won't be as great.
Edited by james_8970, 29 January 2008 - 02:56 PM.