Sensor

Sensor-wise, the MasterMouse MM830 uses the same flagship model as the MM530 and MM520, which is the PixArt PMW3360. It has been out for a few years now, but is definitely still one of the top sensors available. It's very raw, responsive, and pretty much flawless, without any added acceleration. It has a small amount of smoothing above 2000 CPI, though, you can read more about in the Input Lag section.

The nominal acceleration and maximum tracking speed values are 50 G and 250 IPS (6.35 m/s). You can set the resolution from 200 to 24,000 CPI in steps of 100 CPI. The available polling rates are 125, 250, 500, and 1000, which translates into nominal response times of 8 ms, 4 ms, 2 ms, and 1 ms. There are two main lift-off distance settings; on the low one, the sensor doesn't track from 1 DVD in height (about 1.2 mm), while the high setting sets the LOD to somewhere between 1 and 2 DVDs in height (roughly 2 mm). You can also calibrate custom values through the corresponding setting in the software. All the tests below were done on a plain black cloth mouse pad.

Paint Test

There is no jitter on the reasonable CPI steps, unwanted angle snapping (you can turn this on in the software, but I would highly advise against it), or sensor lens rattle.

CPI Divergence

CPI divergence on the MM830 is average. The measured values are a bit higher than the nominal ones, but there's nothing to worry about. If you come from a mouse with absolutely perfect CPI-accuracy, you might want to consider setting your in-game sensitivity accordingly.

Perfect Control Speed

Perfect control speed (or PCS for short) is extremely high with this sensor. The nominal maximum value here is 250 IPS, which translates to 6.35 m/s, but it can actually even go a bit above that. There's absolutely no way of unintentionally reaching such a high speed in-game, even with a ridiculously low in-game sensitivity on a huge mouse mat.

Speed Related Accuracy Variance

This test shows the sensor's accuracy at different speeds. You can see me doing a fast swipe to the right before I slowly slide the mouse back to its original position. There is no acceleration or deceleration; any displacement in this test is almost entirely caused by human error.

Polling Rate

Polling rate stability is rough with the MM830. In all honesty, I personally wouldn't use this mouse on 1000 Hz, but going by the graphs, 500 Hz looks fine. At 1000 Hz, there are some measurable periodic drops that are caused by the LEDs as far as I was informed (there are too many of them operating on the same frequency, which affects the sensor).

After some extremely thorough testing, I couldn't find any noticeable in-game flaws while on 1000 Hz. I tested the mouse on a 144 Hz monitor, in games where I can easily get 150+ FPS, and I did not notice any motion stuttering or delay, or any other anomalies of the sort.

Input Lag & Smoothing

The xCounts graphs indicate that there is no noticeable smoothing until 2000 CPI; right above that value, a small amount of smoothing kicks in, and it can be seen as a kink at the start of the second graph. The smoothing can be measured as about 2 ms of input lag on all CPI steps on and above 2100 CPI.

Click Latency

Click latency is roughly +6.0 ms compared to the SteelSeries Ikari, which is considered as a baseline with 0 ms. The data comes from this thread and my own testings. Testing was done in comparison with a Logitech G203, using qsxcv's program.