"It appears stuttering can happen with only one GPU too? " if it happens with one gpu then its not "microstuttering" its just stuttering and you obviously dont know what microstutter is, random stuttering can happen with any system for various reasons. Have you been on youtube and looked at the so called "microstuttering" vids? they are not microstutter at all, they are full blown FPS drops. It seems to me that most people complaining about microstuttering are not even aware of what it is. A dip in FPS measurable by fraps is NOT MICROSTUTTER. Microstutter is not detected by fraps on screen display. http://www.overclockers.com/micro-stutter-the-dark-secret-of-sli-and-crossfire/
that is how you measure microstutter.