My xfire is working 2x4890's, both cards report same usage through gpu-z, and the usage scales with higher gfx options, I did have problems at first, I found an uninstall, then a CLEAN reinstall of drivers (currently 11.8 ) is what works, then don't touch anything driver side except vsync, start playing with it and it leaves out optimisations that in my experience with buggy ATI drivers never get put back again
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