Sensor and Performance

The Genesis Krypton 750 is equipped with the PixArt PAW3333. According to specifications, the 3333 is capable of up to 8000 CPI, as well as a maximum tracking speed of 300 IPS, which equals 7.62 m/s. Out of the box, seven pre-defined CPI steps are available: 400, 800, 1200, 2400, 3200, 4000, and 8000.

CPI Accuracy

"CPI" (short for counts per inch) describes the number of counts registered by the mouse if it is moved exactly an inch. There are several factors (firmware, mounting height of the sensor not meeting specifications, mouse feet thickness, mousing surface, among others) which may contribute to nominal CPI not matching actual CPI. It is impossible to always achieve a perfect match, but ideally, nominal and actual CPI should differ as little as possible. In this test, I'm determining whether this is the case or not. However, please keep in mind that said variance will still differ from unit to unit, so your mileage may vary.


I've restricted my testing to the four most common CPI steps, which are 400, 800, 1600, and 3200. As you can see, deviation is both inconsistent and significant, which is a below average result. In order to account for the measured deviation, adjusted but still off-target steps of 400, 800, 1600, and 3400 CPI have been used.

Motion Delay

"Motion delay" encompasses all kinds of sensor lag. Any further sources of input delay will not be recorded in this test. The main thing I'll be looking for in this test is sensor smoothing, which describes an averaging of motion data across several capture frames in order to reduce jitter at higher CPI values, increasing motion delay along with it. The goal here is to have as little smoothing as possible. As there is no way to accurately measure motion delay absolutely, it can only be done by comparison with a control subject that has been determined to have the lowest possible motion delay. In this case, the control subject is a G403, whose 3366 has no visible smoothing across the entire CPI range. Note that the G403 is moved first and thus receives a slight head start.


First, I'm looking at two xCounts plots—generated at 1600 and 19,000 CPI—to quickly gauge whether there is any smoothing, which would be indicated by any visible "kinks." Given that the 3333 has no fixed framerate levels, no transitions show up either way, which is why the absence of any kinks in the second plot is not indicative of anything.


In order to determine motion delay, I'm looking at xSum plots generated at 1600 and 8000 CPI. The line further to the left denotes the sensor with less motion delay. Determining motion delay on the Krypton 750 is complicated by the fact that sensor response is not consistent. Hence, these numbers should be taken as approximations. At 1600 CPI, I can measure a motion delay differential of roughly 1.5 ms. At 8000 CPI, a motion delay differential of 5 ms can be observed. There appears to be a smoothing transition point past 5000 CPI, but I cannot tell for sure which step it is.

Speed-related Accuracy Variance (SRAV)

What people typically mean when they talk about "acceleration" is speed-related accuracy variance (or SRAV for short). It's not about the mouse having a set amount of inherent positive or negative acceleration, but about the cursor not traveling the same distance if the mouse is moved the same physical distance at different speeds. The easiest way to test this is by comparison with a control subject that is known to have very low SRAV, which in this case is the G403. As you can see from the plot, no displacement between the two cursor paths can be observed, which confirms that SRAV is very low.

Perfect Control Speed

Perfect Control Speed (or PCS for short) is the maximum speed up to which the mouse and its sensor can be moved without the sensor malfunctioning in any way. I've only managed to hit a measly 4.5 m/s (which is within the proclaimed PCS range), at which no sign of the sensor malfunctioning can be observed.

Polling Rate Stability

All of the available polling rate settings (125, 250, 500, and 1000 Hz) look and perform fine. Polling stability is unaffected by any of the available RGB lighting effects.

Paint Test

This test is used to indicate any potential issues with angle snapping (non-native straightening of linear motion) and jitter, along with any sensor lens rattle. As you can see, no issues with angle snapping can be observed. As mentioned above, it is difficult to say at which point and to which degree smoothing is applied. Even the Paint test is hardly conclusive as jitter increases throughout, so it being or not being lessened by smoothing throughout is equally probable. For what it's worth, even the highest CPI steps shows nothing more than moderate jitter. Lastly, there is no lens movement.

Lift-off Distance

The Krypton 750 does not offer any LOD adjustment. The sensor does track at a height of 1 DVD, but not at a height of 2 DVDs (1.2 mm<x<2.4 mm, with x being LOD height). Keep in mind that LOD may vary slightly depending on the mousing surface (pad) it is being used on.

Click Latency

Since mechanical switches are being used for the buttons in most computer mice, debouncing is required in order to avoid unintended double clicks. Debouncing typically adds a delay (along with any potential processing delay), which shall be referred to as click latency. As there is no way to measure said delay directly, it has to be done by comparing it to a control subject, which in this case is the Logitech G100s. Using the "10 ms" setting, click latency has been measured to be roughly +0.7 ms when compared to the SteelSeries Ikari, which is considered as the baseline with 0 ms, with standard deviation being 0.72 ms. The "20 ms" setting has been measured to be +1.5 ms, with a standard deviation of 0.73 ms, and the "100 ms" setting to be +7.1 ms, with a standard deviation of 0.73 ms. Please keep in mind that the measured value is not the absolute click latency. Comparison data comes from this thread as well as my own testing, using qsxcv's program.