Is this ever used for anything? I started into modular about 5-6 months back, have filled up the better part of a 9U 104 HP rack, and have yet to purchase or encounter anything that utilizes the 5v rail in any way. Am I missing something? Can someone explain its purpose or why many PSUs seem to dedicate even more power to the 5v rail than the seemingly much more important -12v rail? A bit confused about this obviously.