5770 used to be the best bang for buck card but after nvidia started releasing the GTX460 the crown has been taken. The gtx 460 performs slightly better than a 5830 at stock but has LOTS of headroom for OC'ing. imho the 5830, while it performs great is not the best u could do with that price range, that it why lots of people advise to stay clear from it. If I were you I would get the GTX460 but if you want an ati card out of those two i would just get the 5770 and xfire in the future.
Although I'm an Ati fanboy,
i'm telling you to stay away from hd5830,
its not a good upgrade over hd5770.
For the same price tag you could get gtx460 which beats hd5830 + consumes less power + produces less heat + overclocks better.
So gtx460 is the best bang for buck.
If you want to stick with Ati get a hd5850,
its a good upgrade over hd5770 + it beats both gtx460 & hd5770.
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