X220 support for iAMT and vPro

While browsing through the lenovo PSREF (tabook) for X220 model number 4287 (page 69) I noticed models that support iAMT and vPro and models that do not.

Can anyone shed some light on this. Some models have the same processor and I assume same motherboard but one supports vPro/iAMT and the other not.
Example:

4287-3KU iAMT/vPro
4287-2WU No/No

Thanks for your help

Answer

Found the answer myself here: http://www.tomshardware.com/reviews/mobile-core-i7,2443-4.html

The WiFi Link 1000 doesn’t support AMT 6.0, and therefore cannot be part of a vPro-enabled notebook.

Attribution
Source : Link , Question Author : ilanco , Answer Author : ilanco

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