EVC on VC 4.0 U4 with E7540 and E7-8837 won't work

Hello together,

we are using a 3 Host Cluster with DELL R910 in. These Hosts are powerd by 2x E7540 CPUs each.

Now we have orderd a new R810 with E7-8837 CPUs.

Until now we dont have an EVC Cluster, for the new machine i have to create one.

But i am not able to put the R810 in the EVC Cluster.

Everything is licensed in the right way, we are using VirtalCenter Standard, the Hosts are ESX4.0 and the new R810 ist ESXi 4.0 / Advanced License.

Referencing to the kb article here http://kb.vmware.com/kb/1003212 it should be working, when i use the correct setting.

But it wont work ..

Anyone have an idea?

Best regards,

Gerald