What is kit 3 in the co-op for? Does this add parts that builds a 12V supply? Or does it add parts so you can attach a 12V supply that does not have ATX connectors (like a bench power supply). Based on the low price, I would assume the latter but I wanted to confirm. I've been following the threads from the beginning and I kinda remember this being discussed, but I couldn't find it when I searched.