So, it's official. Dual 12 volt rail power supplies that have become common these days are really unnecessary. You know what this means, right?... I can still use my $250 watt ps for my new rig. Hurray! I do have one question for those suckers who have one. How do you differentiate which 12V rail is connected to a particular PC component? Are the plugs labeled 12v1 or 12v2?