I have been a Sys Admin for 7 years. It is a problem, vmotion won't work going from AMD to Intel or vice versa (at least not in any official way). In fact it is highly suggested when building ESXi stacks that you get the exact same model CPU for each server.

https://communities.vmware.com/thread/305792 https://www.v-front.de/2013/04/how-to-vmotion-from-intel-to-...