I understand your situation. The documentation states that they have tested it with a maximum of 8GB, which means that they have not validated it with 4 x 4GB modules. Unfortunately, i dont have that much memory to test it for you. As far as i know, there is no limitation on this board for the memory.
Hopefully, someone else can test it and let you know.
Unfortunately, you can get the answer from Intel Customer Support, as this has not been validated.
To be honest with you, if you are planning to use the system for VT, it is good to get a server board rather than desktop board. (an entry level server board like S3200SH, S5400SF)