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This server requires the addition of 5.5 Patch 03 or higher be applied to support features requiring VT-d support on ESXi 5.5. I.e SRIOV, Fixed PassThrough, etc...
This server requires the addition of 5.1 Patch 06 or higher be applied to support features requiring VT-d support on ESXi 5.1 Update 2. I.e SRIOV, Fixed PassThrough, etc...