Lets clear up some common misconceptions about DPI/CPI. The more DPI you have the more movement the sensor picks up when you move it. So in theory high DPI is better. In reality though many sensors crap out at a certain DPI and start skipping readings resulting shitty mouse movement on screen. Generally I’d say it’s safe to go to 2,000 DPI on a mouse, many can go a bit above that, but I believe 2,000 is pretty safe.
I don’t believe there’s any reason to purposefully go lower than whatever the sensor can handle except for compatibility with desktop mouse use and in case the game won’t allow you to go low enough otherwise. If the game can handle it properly 400 DPI at 30 sensitivity is no better than 1200 DPI at 10 sensitivity. Technically, higher DPI is slightly more accurate and if you could choose between the two I’d go for the higher DPI.
Now if you use a super low in-game sensitivity as well as low DPI you’ll probably not have many issues. The real problems arise when you use high in-game sensitivities with low DPI. In order to up the mouse speed the game has to scale the input of the mouse up with little data which can result in pixel skipping. On the flip side the disadvantage is really not very important these days, if you use high DPI with a super low sensitivity much of the scanned data is ‘thrown out’ because it’s unneeded, resulting in a bit more CPU being used I suppose. But this has such a minor impact on today’s computers I wouldn’t worry.
Personally I’m using 2,000 DPI downscaled by 0.5 post input because 2,000 is too high for me. This is because I actually do need the more accurate readings so my accel driver works its best. Apparently on low DPI it can throw off the accel curve a bit. So I’m using the speed of 1,000 DPI but with the input quality of 2,000.
EDIT: For the guy I actually quoted, I’m using the G502.
Here is a list of mice with flawless sensors and some notes about them by the way. Not super related to the topic but this information needs sharing! https://docs.google.com/spreadsheets/d/1ZzbKDmFOqsP_ut2RdctD01OEbZzbXol6HLwqVkSmZcg/edit#gid=0
If your mouse isn’t listed odds are it’s using a non-flawless sensor by the way. This list has been compiled from a hell of a lot of testing from several competitive video game communities and yeah…it’s this small. Basically almost all mice out there are trash.
EDIT: To summarise. If you use a highish sensitivity regardless of DPI - ergo, you’re putting the in-game sens up - use a higher DPI. If you’re using a low sensitivity regardless, then it really doesn’t matter what you’re using as long as you don’t go past what the sensor can handle. Which is often far lower than what they say it can…