Hmm I've found that if I plug it in using 1000hz and then use a mouse hertz changing program to 500hz it is stable.
Since fluctuating polling rates seem to be a problem on some of the modern motherboards, I've heard that using a pci or pci-e to usb expansion could be a solution for anyone else who gets really stuck.
Should be the same thing. I had the same problem with the Intel P55 chipset, the polling rate was all over the place (known issue). Now i use a PCI to USB card and works like a charm.
IME 3.0 (500 Hz)
Some mice (sensors) have trouble keeping a stable polling rate though, no matter what. My Steelseries Kana misses a poll interval very often and then reports the accumulated counts. Something like this:
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