I almost made a very dumb mistake initially. This power supply has a second 4-pin connector that latches onto the P4, I guess for motherboards/chipsets that require 8-pin power?? I don't actually know. I bought this for a build with an LGA1150, when 2011v3 was already the new hotness, so maybe some higher end chips on that platform required it?Anyway, I swapped the polarity on one of them, but without even thinking, I initially plugged in the other non-swapped connector. Of course that also means that the wires I cut and soldered (removing the pins without the correct tool is do-able, but also a huge PiTA, so I decided for the P4 power to just snip the wires) are going into an incorrectly keyed connector 🙄. I could've just done the same thing again to the other, but it was nothing a sharp knife couldn't correct lol. I also know from experience that the keying is easily bypassed with muscle+stupidity (a much younger me once managed to plug a 4-pin molex into an IDE drive upside down), but that feels a little too barbarian for what was for a long time, my "beige whale" (however uncharacteristically un-beige for the time period it was).