Andrei is right . . . 4000 dpi is relatively useless, I think moving the mouse one inch would take the cursor all the way across your desktop. Three times. I don't even know if you could set the in-game mouse sensitivity low enough to compensate. .001 maybe?
It's really not about how far you can move it, it's about the resolution. 4000dpi allows you to turn down the sensitivity but still be very, very precise. Think of it like zooming in on a picture - you have less area now, but if you started with a high resolution it will still look good.
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Andrei is right . . . 4000 dpi is relatively useless, I think moving the mouse one inch would take the cursor all the way across your desktop. Three times. I don't even know if you could set the in-game mouse sensitivity low enough to compensate. .001 maybe?
It's really not about how far you can move it, it's about the resolution. 4000dpi allows you to turn down the sensitivity but still be very, very precise. Think of it like zooming in on a picture - you have less area now, but if you started with a high resolution it will still look good.