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dlf

Use Intel HD 4K & Radeon HD 7970

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Is it difficult to setup multiple GPUs? How does it work?

You plug them in your PC and you start it. Windows does the rest. :)
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I just tried this with Battlefield 3. I'm surprised at how well it performed on the monitor hooked up to the motherboard (p8z68v-pro with sandybridge 2700k), still got a decent frame rate of 30 (15fps loss) and there was no flicker when dragging the window from my other monitors powered by a 6870.
What Battlefield 3 probably does is to keep running on the GPU it was spawned on, and let D3D deal with getting the image on the correct monitor. If it's on a different GPU then that means copying each frame over to that GPU. If it's stretched across multiple monitors each on its own GPU, then that means copying the part of the frame that has to be rendered on each monitor to its respective GPU. As you've seen there's quite a lot of overhead to doing that. :)
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