I put Gigabyte GT 640 in an Acer Predator G3 AG3620-UR308. In Windows "Screen Resolution", I get 5 displays showing up. Numbers 2,3,4,and 5 belong to the graphics outputs of the GT 640. Where does display #1 come from? Is it from one of the integrated video outputs (PC has VGA and hdmi, both of which came with tape over them saying they are disabled)?