I've got two DELL PowerEdge R730 servers loaded with a dual Xeon E5-2630v3 Haswell. When I installed VMware vCenter, I tried to create a Cluster with VMware vMotion EVC mode set to Haswell, since it's a Haswell chip, but VMware complains about the CPU being incompatible.
The error message that I've got is the following:
The host's CPU hardware should support the cluster's current Enhanced vMotion Compatibility mode, but some of the necessary CPU features are missing from the host. Check the host's BIOS configuration to ensure that no necessary features are disabled (such as XD, VT, AES, or PCLMULQDQ for Intel, or NX for AMD). For more information, see KB article 1003212.
On the BIOS basic things like VT-x, VT-d and AES are enabled. The only disabled things are: "Logical Processor Idling" and "X2APIC Mode".