I'm not sure what exactly that is, will have to do a little research, might be something HP had added for some reason, Dell had one line of systems that the mainMB plug was wired differently and people started burning out there system trying to upgrade the PS, Well Dell did it so you'll need to go direct to them to upgrade but all it did was make a LOT of people avoid Dell for that reason. I'll do ALittle searching and see if I can find out what that is for.