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Going to give it a shot still on my quad 4890s. Been waiting it out until 1 good video could replace 4 4890s. Might be possible with these new generation of cards this year but have to see.
I really considered Xfireing my 4890 and holding off but I didn't feel confident that the xfire support for the HD4000's would scale well enough to compete in games vs HD 6900's and above. Sounds like that hasn't been the case for you?
I ran 2x 4870x2 in Quad Crossfire in my main computer up until last year and they are still running in my secondary computer. Scaling was never an issue for me. I use a G15 keyboard and always use it to monitor my GPU usage. The only game I ever remember that didn't make use of more than 2 GPUs was CoD:MW2, but being based on such an old engine it ran at 100+ FPS even just using 2 GPUs. In every other game, especially games like BF3 where the GPU power really came in handy, they worked great.
When I upgraded to a single GTX680, it ended up being a side-grade at best, which is one of the main reasons I got a 2nd 680. I never stopped being happy with my quad 4870 GPU setup, and maintaining 60fps when I needed it was never a problem. The reason I upgraded was because I got a 120hz monitor and thus needed even more FPS, and also wanted to take advantage of features such as adaptive Vsync. A quad 48xx setup does have it's downsides, but performance in games isn't one of them.
They just released a new legacy driver, 13.1, last month. You can also install the latest CAPs on top of the legacy driver (which is where you get most of your crossfire support from anyway).
no such thing as an agp 8800gt.