There are OEM (Original Equipment Manufacturers) versions using the Z77 express chipset and those do not offer support for Intel® Virtualization Technology so the information on "ark" is correct. We can confirm all Intel boxed motherboards using the Z77 express chipset offer support for VT-d (directed I/O) as described on the website you provided as well.
This is still confusing. Is Intel using a different version of the Z77 chipset than what is used by OEMs like Asus, Gigabyte and others?
Or is the chipset not involved in the VT-d functionality and it is rather up to BIOS and other parts of the motherboard to implement this?
it is stated that the PCH (Platform Controller Hub) for the entire 7-series and C216 chipsets support VT-d. There are differences between these chipsets listed on page 54 (RAID support, management tech, etc) but there is no mention that VT-d support should differ.
Are you really saying that it is correct that VT-d is specified as supported for
but not for
If the above datasheet pdf is correct, Ark should state that VT-d is supported for all chipsets covered by it.