i have problem migrating machines between ESx with diffrent CPU, i saw
the KB 1993 but i didn't understand it and also understood that it isnot recommended.
Send a screnn when try to do vmotion, please.
Have you enabled EVC in your cluster?
no EVC ennabled , why?
To use VMotion between different CPU you must use CPUID Mask (but could be very difficult) or EVC (IMHO the best way).
i will try it and give you feedBack in couple minutes.