Intel Q8200, Q8200S & Q8300 does not support VT as stated on the website, so I am not sure where exactly you saw on Intel website that it does support VT.
Intel Q8300 does not support VT (SLB5W)
However when you say that Intel claimed that all Quad cores came with VT support, that is Intel Quad-Core Xeon processors. DG45ID does support Intel Xeon Quad-core processor like X3230, etc. For a detailed list of compatible processors for DG45ID, follow this URL: DG45ID Compatible Processors and look up Intel Quad-Core Xeon processors.
As for Q9300, it does support VT (SLAWE)
Let us know if you have any further queries we can help you with.
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I have just checked the cpu compatibility list for the board DG45ID.
If you are using the CPU Q9300, the cpu does support VT.
Now as far as I remember, for the new board, you will need to go into the BIOS, go to Security and check if there is an option VT Technology Enabled.
I have tried on a desktop board DQ45CB and a CPU E8500 (VT-Capable), I am 100% sure that in the bios, there is a VT Technology in Security option.
Since you mentionned that you are planning to use windows 2008 and hyper-v, bear in mind that the board does not support Windows 2008.
Please check from the technical product support.
Let us know how it goes. :-)
Hope this helps.
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Have you checked whether you have this option in BIOS?
Go into the BIOS, go to Security and check if there is an option VT Technology Enabled.
If you dont have this option, then it means the board does not support VT-d, the CPU may support VT, but the board also needs to have this option enabled. Otherwise it wont work.
All the best,