I found a very interesting & easy to use tool to check CPU compatibility of your ESX hosts via VirtualCenter.
Interested in knowing if all your physical ESX servers are the same? VMotion Info will help you find out. The application gathers the important system information from your hosts and puts this in one single overview.
Check it out on Run-Virtual. Install, connect to your VirtualCenter & enjoy! .NET Framework 2.0 is required to run!