Which Optiplex motherboard for VT-d support?

Link to 760 Tech Guidebook p. 31

Link to 760 Svc Manual p. 151

 

As shown above, the Optiplex 760 tech guidebook & svc manual both show that VT-d is possible.

I have two Dell Optiplex 760 MT with the Intel E8400 CPU, which has VT-d virtualization technology.

https://ark.intel.com/products/33910/Intel-Core2-Duo-Processor-E8400-6M-Cache-3_00-GHz-1333-MHz-FSB

Both 760s have motherboard 0M858N and BIOS A16 but I don't get the option to enable VT-d.

The only option is to generally enable "virtualization", which only enables VT-x. (I know that this option doesn't enable VT-d because VMware and VirtualBox will not allow me to "passthrough" a PCI card because VT-d is not enabled).

My guess is the 0M858N mobo doesn't support VT-d since Dell docs say it is an option with 760 models.

So there must be other motherboards that shipped with the 760 MT that do support VT-d.

Questions:

1.  What are the P/Ns/model #s for the Optiplex 760 MT motherboards that do support VT-d?

2.  Do these motherboards support Core 2 Duo CPUs like my E8400 or only Core 2 Quads?

3.  If I'm wrong and the 0M858N does support VT-d, then why don't I have the option to enable it on either PC?

Thank for replies :Smile:

 What my BIOS shows:

Oh, and in case you're wondering, yes, I do have NX/Execute Disable Bit turned ON.

 

What it's supposed to show (found on Google Images):