I don't remember

  (Edited: )

where I read it (probably some teamliquid theorycrafting), but supposedly setting mouse sensitivity in windows to 6/11 and in sc2 to 51% ensures that there is no loss of information when moving the mouse. I don't quite remember the reasoning behind it also, but it's still the settings I use (along with a mamba 2012 @ 700, 1000 & 2000 dpi, and 500hz).