Yes that's what it was. Secondary 12v for the cpu/mobo. I've been on the same 850w PSU (EVGA G2?) -legendary, for the last 8 years. I was way over budget 8 years ago but it's proven useful now that I'm running a 3080.Can confirm. My Corsair RM650i doesn't have the 2nd 8-pin CPU power cable that can be connected to my motherboard. Because I'm running a relatively low power R5 processor, it's not a problem, and I don't need it, but if I had one of the higher SKU's, I'd probably want it.