I've seen mentions in discussion forums that Intel Virtualization technologies are sometimes not correctly implemented by motherboard vendors, and that Intel has a tool that can verify the correctness of these.
Here is one such mention:
Raja@ASUS: "Update on Z77 from HQ, all tests will not pass so we will not claiming support like other vendors. You can obtain Intels Vt-D verification tool and test for yourselves"
Where can I download this VT-d verification tool?
Retrieving data ...