Which version of the cdm probe are you using. I have 5.80 installed in my 8.51 lab and the option for collecting the No. of CPU is available on the Advanced tab for the cdm probe installed on my primary hub which is a Windows 2012 R2 system:
I also check this in my 9.02 lab and see the same for the 6.33 version of the cdm probe also installed on a Windows 2012 R2 robot.
You might want to try deleting all of the *cdm* files from the %TEMP%\util directory on the system where you are running IM to force downloading a new copy of the cdm Configure GUI binaries to make sure you are using the Configure GUI for the version of cdm that is installed on your WIndows robots.