I'm finding it difficult to find solid information about vt-d support on IB boards and was hoping the community could confirm/deny support on the current offerings.
The only manufactuer I've seen that claims support on any of their boards is ASRock; the manuals for the majority of their lineup mention it in passing.
I found this forum post which seems to indicate GIGABYTE is working on vt-d support and offer beta BIOS versions to enable it at your own peril: http://forums.tweaktown.com/gigabyte/48493-x58a-ud7-rev1-vt-d.html
As for ASUS, they seem to be claiming that vt-d support on newer chipsets is "impossible due to hardware limitations". Some useful information can be found on this forum: http://hardforum.com/showthread.php?t=1688360&page=6
The ASUS rep indicates that only Q-series chipsets were validated by Intel to be fully vt-d capable. Apparently ASUS is having trouble passing Intel's vt-d conformance test suite, which leads me to question whether or not ASRock is being disingenuous about their claim to support vt-d; evidently at least some people have had success with ASRock's boards, however.
Aside from motherboards, if anyone can offer advice on setting up VGA passthrough under ESXi, I'd be very appreciative. I know this isn't an officially supported feature, but it seems others have gotten it to work, and I'm willing to put in the time to make it work for me. I've heard various reports that nVidia cards are no good for this, but all I have right now is a GTX 460. I'd like not to have to buy a new card unless necessary; can anyone out there report success with this card and/or other nVidia cards?