To use EVC, you must be running ESX 3.5 Update 2 or higher with VirtualCenter 2.5 Update 2 or higher and have compatible processors in your servers. EVC does not allow for migration with VMotion between Intel and AMD processors.
Note: To search for supported EVC CPU types, see the charts below or refer to the WebHCL and search by EVC Modes.
CPU Charts can be found by clicking Here