How to find different Intel Xeon processor's P-states?

How to find different Intel Xeon processor's P-states?

Different p-states will let processor core work at different frequency level and voltage level. It's enabled by Intel Enhanced Speedstep technology.

I want to do some power management research(on Xeon since it has at least 4 cores on a socket). However, different processor's p-states capability is very different (for example, some processors will only have 2 p-states while others will have more). I know how to check it on the machine. But does anyone know if there is a place showing all the information for all Intel processors? So I can figure out which processor I am going to buy. I can not find such information on Intel's website.

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This is a duplicate and please take a look at a thread with the discussion of the subject:

Forum Topic: How to find different Intel Xeon processor's P-states?
Web-link: software.intel.com/en-us/forums/topic/391483

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