"GeForce 9800GX2 was released earlier today and when we posted the first bit of news, there weren't any reviews posted, but as the hours have passed, the reviews have been dropping in. GeForce 9800GX2 is based on the G92-450 core and is basically two cards slapped together and the cores connected via SLI. In theory, this would give us GeForce 8800GTS 512MB in SLI, but there's actually more than that. We've been estimating the performance to be in the same area though, and we were more or less dead on.
GeForce 9800GX2 is an extreme high-end card and the performance is much like the previous GX2 card(s) from NVIDIA; extreme at very high resolutions, but when the resolutions come down 1280x1024 and lower, the card performs the same as a single GeForce 8800GTS, or worse."