Thats amazing! I know for a fact it will. I have a friend that has one in his late '08 Mac Pro and he runs 2 23" dell monitors. 
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Dual 4870's in a new MacPro? Why?
- Thread starter rwdds
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One more note to anyone who is wondering. I booted over to game for a little while and you can shutdown your second monitor through display settings in control panel using Windows 7.