In general, the 6790 will tend to be a bit ahead.ATARI800XLfan wrote: seeing as you mentioned Nvidia how would a Geforce GTX 550 Ti compare to the AMD 6770/6790? Have never used Nvidia on a desktop before. Had one in a laptop, 8800GTX but it fried after 3 years.
Some games, the Ti 550 will be better than either AMD offering, but more often, it'll either trail both of them, or will fall between - in many cases depending on the settings. At least from benchmarks when the 6770/6790 were released, the AMD cards seem to scale better for higher resolutions.
That said, they're all the same general ballpark. I doubt you'd find a game/setting playable on a 6790 that wasn't on the other two.
Putting up the extra $40 or so to go to a 6870, however, probably would net you a performance increase large enough for that to be a possibility.