What's Mouse DPI? Does Mouse DPI Matter in Gaming?
What is DPI?
DPI means Dot Per Inch. In theory, if a mouse has 1600 DPI, then, if you move your mouse one inch (2.54 cm), the mouse cursor will move 1600 pixels.
The higher the DPI, the more sensitive the mouse is. That is, you move the mouse even a tiny bit, the pointer will move a huge distance across the screen.
Almost all mouse sold today have about 1600 DPI. Gaming mouses usually have 4000 DPI or more, and can be increased/decreased by pressing a button on the mouse.
What is USB Polling Rate?
USB Polling Rate is how frequent your computer checks for signal from the mouse.
USB Polling Rate is measured in Hertz, meaning, number of times per second.
By default, USB polling rate is 125 Hz in Microsoft Windows and Linux.( 125 Hz is 125 times per second. 1 second divided by 125 is 0.008. This means, the computer check mouse signal every 0.008 second).
A gaming mouse usually lets you change the polling rate. Many gaming mouse will have a polling rate of 500 Hz or even 1000 Hz. Some gamer claims that 500 Hz polling rate creates less lag, but that may just be psychological.
The older interface tech, the PS/2 port, does not have polling “problem”. That is, it doesn't periodically check for signal. Rather, any signal is transmitted immediately.
Does DPI Matter in Gaming Mouse?
The short answer is: No.
Even cheap mouse today have at least 1600 DPI, which is enough. Higher DPI than that is hard to control the cursor position.
If you have high pixel-density screen, such as Mac's Retina Display with 300 pixels per inch, then you probably want higher DPI.
First-person-shooter pro gamers often prefer low DPI, as low as 800 DPI. This way, you have very precise control of movement.
some pro gamers use a huge mouse pad. The mouse pad is as wide as a full-sized keyboard. So they swing their whole arm to use the mouse with low DPI.
“The industry has been highly successful in establishing this number as something highly important, when in reality it doesn't really mean all that much,” Kim Rom, the CMO of SteelSeries told Ars. SteelSeries makes some of the more respected mice and headsets used by pro gamers; this is a company that knows how to make a performance product.
Technology has progressed to a level where you can move your mouse, say, one inch on your desk, and your cursor will move 2 or 3 times your screen length. That sounds impressive for sure, but where is the real value in that?” Rom asked. “That doesn't make you more precise or accurate; I would argue that it does exactly the opposite. A higher DPI in a mouse doesn't offer a lot of value, and it is not a benchmark for how precise or awesome the mouse is. It's simply a measure of sensitivity.
source: 〔Does DPI matter in gaming mice? One mouse-maker says no By Ben Kuchera. @ http://arstechnica.com/gaming/news/2010/02/does-dpi-matter-in-gaming-mice-one-mouse-maker-says-no.ars〕
Today, the mouse tracking tech has advanced to a point that doesn't make any sense for consumer to understand.
here's a video by Logitech engineer explaining DPI.
See also this great article: 〔Gaming mouse myths busted By Wes Fenlon. @ http://www.pcgamer.com/gaming-mouse-myths-busted/2/〕
What DPI Should I Set My Mouse To?
I recommend you just try different settings.
Different mouse have different DPI, and we also have different screen resolution, and different operating systems and games interpret mouse signals differently. All of the above effect the optimal DPI setting.
Also, we all have different habits of holding the mouse, and different motor-skills.
Gamers have been debating about DPI since Microsoft made optical mouse popular around late 1990s, since, it has become a cult issue.
Whichever setting you feel the most comfortable, the better it is, for you.