Apparently a Chinese website has got hold of an ATI 5830 and reviewed it. Here's the original article link and here's a Google (badly) translated link. It seems to be a detailed and decent review.
Performance wise it seems to be on par with the GTX 275, sometimes slower than it and sometimes faster. The article also mentioned that there are no reference designs for the 5830, so all the cards are going to be custom designed (as see in the photographs on the last page).
Some benchmark results:
Performance wise it seems to be on par with the GTX 275, sometimes slower than it and sometimes faster. The article also mentioned that there are no reference designs for the 5830, so all the cards are going to be custom designed (as see in the photographs on the last page).
Some benchmark results:
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