Every 5830 review was done with cat 10.2 release drivers and they SUCKED. It's a lot closer to the 5850 then the 5770
Show me the review with newer driver and major performance boost over 10.2. New driver never does miracles, it wont give you more than few percent of performance increase. More stability - YES. Much more performance - NO. The point is - no matter what 5830 will always SUCK against 5850.