troubleshooting Question

Cannot vmotion between Intel Xeon 55xx and 56xx

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tdemeyerFlag for Belgium asked on
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Last week we added an extra ESX (4.1) server to our datacenter. Unfortunatly, this new machine has Intel Xeaon 5620 processors, and our two other machines have Xeon 5550.

When trying to vmotion  machines between the "old" an "new" servers, we get an error at the vmotion validation phase:
Host CPU is incompatible with the virtual machine's requirements at CPUID level 0x1 register 'ecx'
Host bits: 0000:0010:1001:1010:0010:0010:0000:0011
Required: x000:0x0x:10x1:1xx0:xx10:xx1x:xxxx:xx01
mismatch detected for these features:
* General icompatibilities

Googling for this error led me to :

This article indicates that for "Group E" type vmotion, I have to apply the AES mask...

The mask to be used is described in KB article:

the article indicates I must apply mask "---- --0- ---- ---- ---- ---- ---- --0-" to level "a" (??). I found no level "a", so I assumed this meant "all" levels.

If I shutdown my virtual servers, and apply this mask to all ecx levels, I can vmotion XP's, 2000 and 2003 servers without any problem. Win7 and 2008R2 don't boot with this mask applied, they all end with a BSOD STOP error.
Trying to set up an completely new machine with this mask also ends with an blue screen during setup.

Anyone an idea how to solve this problem???
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