I have an ATX PSU that has two 6pin connectors for PCI Express power. Both have Gnd on the lock bar side, and +12V on the opposite side. I lost modular cables that came with the PSU, and it made me to start to dig.
According to this answer on our sister site, in 6-pin configuration pin 5 is Sense A. In 8-pin, pin 6 is sense A (same position as Sense A in 6-pin config) and pin 4 is Sense B.
But what are these pins supposed to do? I know that most people just connects Gnd there and calls it a day, and I could too, but I wanted to ask about the meaning behind it. It's called "Sense" for a reason, I suppose. So, what is that reason?