Have you tried this? Some TV channels stutter (heavily)/look "flawed"
as it looks like to me right now is, that my system tries to vsync evr on the base of the display with the highest refreshrate attached for some reason. even if i switch primary monitor or even disable one. sucks...
Since you will get tearing with VMR9 (no v-sync is obeyed with Vista 7 win 7 with that renderer) you should be able to get same results with EVR and turning AERO off.
Can't you add a custom resolution?
Based on that I would say it is currently impossible to run MP on setups where display refresh rates are differing on Windows 7 / Vista.