Probably I found the problem.
In the compiler options (visual studio) there's an option to specify the minimum CPU architecture (Enable Enhanced Instruction Set ) /arch:.
For some reason with the preview IPP sample using /arch:SSE the software work anyway on old CPU.
With latest version, instead, on old CPU I got the Illegal Instruction.
So if I leave the option to unset I can get the software work.
So just renaming the add-on libraries from ipp*px.lib to ipp*_l.lib I can get the software running on old CPU: anyway you do not have to call the function to obtain the Mhz of the CPU