I'm planning to build a system with the ASRock b85m pro 4 MB and intel i5 4570 cpu.
As i want to use multiple virtual machines with this the build, I have been advised to use vt-d.
According to the manual, the MB supports vt-d. Two questions:
1) according to ARK | Intel® B85 Chipset (Intel® DH82B85 PCH), the B85 chipset does not support vt-d.
How then is it possible that the b85m pro 4 does support vt-d?
2) If i update the bios, drivers and utilities, will i still be able to use vt-d or is it possible this option is disabled after update?

any help much appreciated.