From Nvidia:
With two on-board GPUs, a GeForce® 9800 GX2-based graphics solution is bar-none the fastest graphics card available. Be blown away by scorching frame rates, true-to-life extreme HD gaming, and picture-perfect Blu-ray and HD DVD movies.

Lightning speed graphics performance
The dual-GPU engine has 256 screaming fast stream processors and a 1GB framebuffer, allowing it to perform 30 to 50% faster across games than the previous performance leading GeForce 8800 Ultra GPU.

Picture-Perfect HD
Extreme HD game play, unsurpassed movie picture quality, and elegant design are at your fingertips with the GeForce 9800 GX2-based graphics card. Now you can be right in the middle of the action – whether you’re fragging the enemy or watching an HD movie, your experience will be ultra-realistic.



Now our turn:

You might wonder, what is so special about the 9800 GX2? Well, it is the dual-GPU (double video card). Nvidia is not popular in making this type of cards. Their last dual-GPU model was GeForce GX2 and it was released in the summer of 2006. Having dual-GPU video card can be useful to users for gaming and video editing. You might need it if your motherboard doesn’t support the SLI mode.

This video card also allows you to use quad SLI mode, so if you have motherboard that supports SLI, you can connect even more video cards. Currently, the video card’s price retails at about $600.

After doing many tests, we came in conclusion that this card is better than most cards available on the market, but 9800 GX2 has some technical problem when playing in Crysis on very high quality. Also, this video cards is very long, so don't even think about getting one if you have a little case. In my personal opinion, since new models of video cards come out every month, I would recommend you to get GeForce 8800 GTS. This video card will work just fine and it won’t take $600 from you.

Video Reviews:





Pros:
Fastest card available

Cons:
Price/Speed ration
Expensive