Can we please have a specific description of what u meant by "width", maybe a screenshot might help.
From my experience, the way dashboard behaves is that it does not get effected by screen resolution. So it is advised to design the dashboard to follow the 4:3 screen ratio, this is to be save as the 4:3 is the smallest width in the list of resolutions.
If you are certain that the users only use 16:10(laptop) and above, then you may develop the dashboard to contain objects to the further right, but if this particular dashboard is viewed in 4:3 again, the dashboard will be truncated and a horizontal scroll bar will appear.
