Hello Hung,
I understand that you are inquiring about the possibility to get dual displays with one VGA port.
In regards to your inquire, you are a little confused on the features supported on this motherboard, the feature is for the motherboard to utilize the embedded graphics controller plus a video card and combine the amount of displays that can be connected. In other words, you can connect 2 displays to the motherboard and use the onboard graphics plus 2 more on the video card and have quad display
Regards.
PV
