Netkas is pretty certain that the HD 4890 will work on the Mac Pro. For some reason he seems to waiting on 10.5.7.
I looked at 8 OpenGL benchtests with the HD 4890 and the HD 4870. At the best, the 4890 beat the 4870 by 14.8 percent. At the worst, the 4890 beat the 4870 by 10.7 percent. The HD 4890 beat the HD 4870 by an average of 13.5 percent.
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