U-stutter is micro stutter right? Just making sure. If it is the I have this to say......
When I put together my 270x and 7850 the stutter was horrible to the point of unusable, but with a few setting tweaks it has calmed down to the point of *barely* noticeable. What I mean is that only a perfectionist would be unhappy with the end result. Most of the reading I did do seemed to say that you wouldn't ever be able to get rid of it entirely, while still others say it doesn't exist
I do not know if the stutter differes from card to card though (which I think is the meat of your question)