http://www.xbitlabs.com/articles/video/display/geforce9800-gx2_20.html#sect0
As for Nvidia GeForce 9800 GX2, it retained all the advantages and drawbacks of Nvidia GeForce 7950 GX2 taking into account the new technologies, of course. Some of them are there because of the peculiarities of contemporary multi-GPU implementation, and some will be fixed in the future. For example, they will implement multi-monitor configurations support in SLI mode. For a gamer that has over $600 at his disposal, it is a good choice: in the worst case the card will perform at the level of a GeForce 8800 GTS 512MB, which is pretty good, and with proper driver optimizations it can even demonstrate unattainable performance. Nevertheless, those who already own a GeForce 8800 Ultra shouldn’t really hurry to computer stores just yet.
As for Nvidia GeForce 9800 GX2, it retained all the advantages and drawbacks of Nvidia GeForce 7950 GX2 taking into account the new technologies, of course. Some of them are there because of the peculiarities of contemporary multi-GPU implementation, and some will be fixed in the future. For example, they will implement multi-monitor configurations support in SLI mode. For a gamer that has over $600 at his disposal, it is a good choice: in the worst case the card will perform at the level of a GeForce 8800 GTS 512MB, which is pretty good, and with proper driver optimizations it can even demonstrate unattainable performance. Nevertheless, those who already own a GeForce 8800 Ultra shouldn’t really hurry to computer stores just yet.