It's been explained when the requirements were first announced. It doesn't list the Ati 4890 either and that's what i'm running, but i believe it will work just fine since the earlier and slower 4850 and 4870 are listed.
They confirmed it themselves back then (i think the same question popped up and Luthier answered it), if you have a newer/better GPU than the ones listed you'll be fine.
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