CSGO Mouse sensitivity in a banana peel:
m_yaw and m_pitch = degrees of ROTATION per dot registered by your mouse.
Sensitivity = multiplier to m_yaw rotation.
DPI = Dots registered per inch of mouse movement.
So if you use 800 dpi and 2 sens, you will move (800 x 0.022 x 2) degrees per inch of mouse movement. That means if you use 800x600, you will ROTATE the same ingame as with 2560x1440, because sensitivity in a 3d game where your view is rotating is not the same as a cursor, which is moved across a 2d space made up of individual pixels, to which the dots per inch respond to changes in cursor position pr inch of mouse movement.