I actually meant the pwrgood signal between the processor and buck controller (or whatever you call it; it's the small chip on the motherboard that generates the proper supply voltage for the processor according to its VID[4:0] output). Also called PWRGD, PWROK (like in the AMD datasheet mentioned above), PGOOD, etc.NickS wrote:On an ATX PSU connector, the PWRGOOD signal is probably known as PS-OK.