If i play CSGO..
what is the best AMD CrossFire Mode in order to reduce stutter and increase fps..
is it Optimize 1x1 or AFR compatible?
or should i use CSGO AMD pre-defined profile?
and should i turn ON the frame pacing?
will it increase my fps? or what?
Frame pacing won't increase your fps or at least not to any noticable degree. It tries to keep the frame time consistant so things are as smooth as possible instead of some frames being delivered faster or slower than the previous frames.
Generally you should use the inbuilt Crossfire profile if one is available.