So having 2 plugged in is a good thing? I'm just trying to figure out which way is better. I have enough plugs on my PSU to have both plugged in. Seems to be running fine with both...... hmmmm why would it run off of one if there is room for 2? Wouldn't you want both?
Both is better.
Why wouldn't you (if you were a motherboard manufacture) choose to allow only one if possible?