nevrin

I second that 120hz monitor. Better PSU or GPU will just give you more of what you allready have. 120hz monitor opens completly new possibilities. Colors are ussually garbage, but I think benefits far outweight negatives. Another thing might be a keyboard. What happens when in Dayz you press W E D keys all at the same time? On a proper gaming keyboard all the keys should be active at the same time. Which in DayZ means you can lean right and move forward and sideways all at the same time. Usefull when cutting corners. Manufacturers call this feature n-key rollover or anti ghosting.

Make sure you are running Combined operations, not original Arma 2. Keep in mind, that unlike in "Shooters", there is certain maximal turning speed in Arma 2. This is sometimes missinterpreted as negative mouse acceleration/lag. Set your mouse sensitivity to make the movement feel more natural. I even had to set different sensitivity in X and Y axis. There are some acknowledged mouse issues, that arent going to be fixed until Arma 3, but those are minor problems, that dont make the game wholy unplayable.