Well I think just using the term 'accuracy' is very arbitrary. I believe that what you're looking for is a more accurate reading of your movements by the mouse's hardware. Simply changing the DPI isn't going to make you more accurate. DPI does nothing but exactly the same as changing the mouse sensitivity. Its just another threshold for you to toy with. Like balancing the windows volume control with the one that you have in the game settings.
If you were to turn down your mouse sensitivity but turn up DPI you wouldn't be changing anything. Sensitivity basically alters the same thing as DPI. How much, how much distance the mouse traverses, for every inch you move it.
I believe that when the article I linked said that DPI makes you more accurate it meant that you attenuate the mouse to respond to your way of playing and using the mouse. If sensitivity is too low then you can't get the mouse where you need it in one move. However if its too fast then it gets unusable. Turning up DPI to max is just like turning sensitivity to max. They both likely are too much. They're basically the same thing.
However the polling rate determines how accurate the mouse records your movements and relays that information to the computer. Fact is that you may not be putting the mouse where you want it if you don't tweak your sensitivity/DPI to the right settings but thats you, not the mouse. However if the polling rate is too low then the mouse isn't recording enough of the movement and as such the way you move it and the way the mouse thinks you're moving it can be different. Like lag or not recording all your subtle movements.
You could also try to think of it this way. DPI has to do with how your stereo receives the signal from the CD. The quality varies based on how well made it is. But if you get bad sound then it could just be your receiver. But if the laser reading the CD isn't reading it as well then you can get skips. Or if a needle on a turntable isn't catching the sounds correctly.
There are many layers to the interface. surface to mouse optic->mouse optic to internal mouse software->internal mouse software to proprietary desktop software->proprietary software to windows->windows to game
Anywhere in between there are settings to tweak. DPI only affects how the final product comes out. The Polling rate is the beginning of the process and ultimately tells you how accurate your mouse if reading your movements. Thats accuracy of the mouse. DPI is to do with accuracy of the person using it.
Subtle difference. However the claim that higher DPI helps you game better is a fallacy. Its just a repackaging of standard mouse sensitivity. Software related.
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