8000 Hz: A Closer Look

In general terms, polling rate can be described as the rate at which the data generated by the mouse is transmitted from the mouse to the PC via USB. Polling rate is measured in Hz; i.e., the number of times per second. The higher the polling rate—the lower the polling interval—the more frequently are the cursor position and any other input events (button inputs) updated, resulting in improved positional accuracy and generally reduced latency. At 1000 Hz, the polling interval is 1 ms, which means the PC receives a new update every 1 ms. At 2000 Hz, the interval is 0.5 ms, at 4000 Hz, the interval is 0.250 ms, and at 8000 Hz, the interval is 0.125 ms.

8000 Hz: The Technology and How to Use It

In the past, multiple mice claimed to be capable of 2000 or even 3000 Hz polling have been released. However, each and every time, these claims turned out to be inaccurate. All of these mice had one thing in common: They were full-speed devices typically incapable of running at polling rates higher than 1000 Hz without modified USB drivers. The M65 RGB Ultra, on the other hand, is a high-speed device and thus natively capable of polling rates higher than 1000 Hz. Furthermore, it is equipped with a sensor (PAW3393) capable of running at a sufficiently high framerate, which ensures that it is not just identical data being sent more frequently.


Setting the M65 RGB Ultra to 8000 Hz has to be done in its software, as the M65 RGB Ultra is set to 1000 Hz polling by default. Upon setting the M65 RGB Ultra to a polling rate above 1000 Hz, one is greeted by the message shown above. The M65 RGB Ultra can be set to 125, 250, 500, 1000, 2000, 4000, or 8000 Hz within iCUE. However, it is important to note that those values merely denote the maximum applicable polling rate. If the mouse isn't physically moved enough to generate a sufficient number of motion events (for 8000 Hz at least 8000 pixels worth of motion per second), fewer updates will be transmitted, resulting in a lower effective polling rate. Accordingly, using a sufficiently high CPI step on the M65 RGB Ultra is highly recommended. I would advise using at least 1600 CPI, and possibly even higher depending on one's effective in-game sensitivity (turn circumference). The higher the turn circumference, the more physical motion is typically generated, and lower CPI is thus required to saturate the polling rate. Conversely, the lower the turn circumference, the less physical motion is generated, and higher CPI is thus required to saturate the polling rate. It should be noted that on the M65 RGB Ultra, click and sensor motion data aren't fully detached internally. Hence, a lower polling rate will increase click latency compared to 8000 Hz.

In order to get the full benefit out of 8000 Hz polling, certain conditions need to be met. First, it is recommended to have a sufficiently powerful CPU; i.e., one with six physical cores and appropriately high IPC to match. Second, the OS has to be capable of 125 μs or lower interrupt moderation. This is true of Windows 8 or higher, where interrupt moderation on XHCI will typically be 50 μs, but not of Windows 7 and lower, where interrupt moderation is never below 1 ms unless changed manually, which isn't easily done. On EHCI, interrupt moderation can be expected to be 125 μs on Windows 8 or higher, which is sufficient but not optimal. Third, plugging the M65 RGB Ultra into a USB 3.x port in XHCI mode is therefore recommended. Any USB 3.x ports forced into EHCI will be equivalent to a native USB 2.x port. As a general rule of thumb, one should use a USB port native to the CPU and not connect any other high-polling devices to a port of the same hub. Even if all of these conditions are met, actual polling stability during higher workloads will further depend on general system and OS health. As such, it is recommended to use a reasonably optimized, light on bloat OS installation in conjunction with the M65 RGB Ultra.

Performance Testing

I'll be testing general tracking, polling stability, and motion delay for 2000, 4000, and 8000 Hz each. All testing is performed at 1600 CPI. Please note that the M65 RGB Ultra is moved first and thus receives a head start of roughly 0.3 ms.

2000 Hz:

Count distribution continues to be very tight. Exactly 0.5 ms are averaged, and the M65 RGB Ultra is ahead of the G403 by roughly 0.5 ms.

4000 Hz:

Count distribution has loosened somewhat compared to 2000 Hz. Exactly 0.250 ms are averaged, and the M65 RGB Ultra is now ahead by roughly 0.7 ms.

8000 Hz:

Not much changes in regard to count distribution. The M65 RGB Ultra successfully averages 0.125 ms and thereby matches the Razer Viper 8K. The motion delay differential is around 0.8 ms.

Subjective Evaluation

Of course, the performance metrics obtained through empirical testing are just one side of the coin. The more pressing question is whether 8000 Hz is at all noticeable in games, and if so, to which degree.

To properly answer this question, note that someone being unable to notice something does not mean it isn't there objectively, or does not provide an objective advantage. The latter is most definitely true of 8000 Hz polling on the M65 RGB Ultra, so the matter shifts towards whether said advantage is meaningful and thus noticeable one way or another. That said, playing on a 165 Hz monitor at typically 200 FPS or more, I indeed struggled to notice a difference in terms of latency. As explained above, saturating the full 8000 Hz polling rate takes quite a bit of mouse movement and thus isn't typically reached all the time anyway, so most of the time, the benefit in terms of latency compared to 1000 Hz is around 0.5 ms, which is well below the sensory capabilities of the average human. The greatest effect of 8000 Hz may indeed not be observed in terms of absolute latency, but rather smoother cursor feel and general positional accuracy, more specifically in games requiring high precision in regards to click timing. Particularly games supporting sub-frame input will benefit to a greater degree from 8000 Hz, such as Overwatch or Diabotical with their respective settings enabled. Generally, in order to get any use out of 8000 Hz, I'd recommend using a strong CPU and a 240 Hz or even 360 Hz display. Slower panels will inevitably struggle to even display the granularity afforded by 8000 Hz polling. Those with weaker CPUs may experience worse input response simply due to the higher CPU cost, which means any advantage gained by 8000 Hz immediately cancels itself out.

When choosing between 2000, 4000, and 8000 Hz, I would advise taking the middle route, which is 4000 Hz, as overall responsiveness is virtually on par with 8000 Hz while being lighter on the CPU. The parity in terms of latency is further underlined by the fact that 4000 Hz is much easier to saturate, so most of the time, there is no difference in practice whatsoever, aside from the ever so slightly higher click latency.

Appendix: List of Tested Games

As there is little reason to use the Corsair M65 RGB Ultra at polling rates higher than 1000 Hz in non-competitive games, I'll exclusively list games that are typically considered competitive. Please note that a game running fine for me won't necessarily run fine for everyone, as it merely means it generally works well with 8000 Hz polling. Conversely, a game not working well at 8000 Hz on a specific system isn't generally incompatible with 8000 Hz polling. In general, it should be noted that polling performance above 1000 Hz is a function of one's system, not the mouse. Unfortunately, iCUE doesn't support application-specific profiles, so one would have to manually lower the polling rate in games that don't work well with polling rates higher than 1000 Hz.

• Call of Duty: Black Ops II Up to 8000 Hz
• Diabotical Up to 8000 Hz
• KovaaK's Up to 8000 Hz
• Quake Champions Up to 8000 Hz
• Quake Live Up to 8000 Hz