I used this:

but I guess these methods are all the some.
And mouserate.exe still shows 125hz on my new purchased MS IME3.0.

Win 7 64bit

-Testmode is enabled
-amd64 hidusbf is successfully installed via ngohq tool

Whats the problem?

Mouse seems legit, doesnt look different in comparison to my old ime3.0, but it is the steelseries version. Maybe its still a IME3.0 clone and doesnt support higher polling rates?

But I remember to had similar problems wioth my old legit wmo too.
it ran constant 500hz on win xp. But under Win 7 no chance. :(