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1-What DPI do you guys use?
2-Just be sure to use a DPI setting that is in an increment of 90 (450, 630, 810, 1800 etc.)
1-Why is what?
2-Pixels = Squares Squares = Right Angles Right Angles (90 deg. obviously) + Mouse resolution that is a multiple of 90 = more accurate tracking
2-Go into MS Paint with Windows Sens. slider at the 6/11 position and Pointer Precision turned off (this will ensure that you are not pixel skipping nor filtering out mouse input so your mouse will be getting a 1:1 response true to its specified DPI) , and draw squiggly lines/circles with a DPI that is a multiple of 90, then do any DPI that isn't a multiple of 90, and you'll notice a significant difference between the two. The DPI setting that is NOT a multiple of 90 will produce lines that are much more jagged than the other. If you've ever noticed with Razer mice, the 4 DPI values they offer are 450, 900, 1800, 3600, and that is why.
Here is a link to a very informative thread that will go into great detail about mouse settings/sensitivity.
http://counterstrikesourcetactics.blogspot.com/2008/02/css-mouse-optimization-guide.html [counterstrikesourcetactics.blogspot.com]