Originally Posted by aroc91
As far as I know, no. DPI measures how accurate your mouse is, so regardless of what your in-game sensitivity is, using a higher DPI setting is better.
DPI/CPI does not measure your accuracy. All it measures is how small of movements the mouse sensor can detect. It's physically easier to be accurate with a lower CPI/sensitivity as you have more room irl to hit the same size target onscreen.
You basically want a 1:1 ratio counts(dots) to pixels of movement at a CPI that feels right to you and it's best to set this at a hardware level as anything other than 6/11 can cause unwanted side effects in windows and lowering or increasing the sensitivity in game beyond a certain point can cause problems too, eg anything below around 1.8 sensitivity in Counter-Strike causing deceleration.
Because linear 1:1 is obviously best, you don't really need that much DPI. Consider your standard 90 degree field of view in an FPS. That's horizontally 1920 pixels at 1080p. A 180 degree heel turn is 3840 pixels of movement. Even if you are a high sens player, you don't need more than say 1800 DPI (a little more than 2 inches for 180) as otherwise hitting anything will be impossible. Too low a DPI for your sensitivity preference can cause pixel skipping unless you turn on acceleration, when you'll have trouble hitting anything.
I personally find 400 DPI to be fine at 1440x900.