Even with EVC enabled, you cannot vMotion between different CPU makes (AMD to/from Intel).
EVC allows you to vMotion between different models and families of a single make of CPU.
Per VMware: Enhanced vMotion Compatibility (EVC) processor support
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.