Another question:
I have a monitor I could plug with this DVI to VGA adapter. Will this work the same as the dummy if I plug in the monitor to the card, but not the monitor to the electricity? or I have to conect it to electricity?
Just plugging it is in fine, doesnt need to be turned on, what happens on the monitor is the exact same thing you're doing with the resistors, when plugged in it creates the loopback that lets things be detected, so if you have the spare monitor just hook it up and have 0 risk of anything going wrong.