Kind of curious about dual power supplies. I have my mod rigs build set-up with dual power supplies but when i shut down the computer the only way to shut everything down is to flip the switch on the secondary power supply. The only thing it is powering is the second kingpin gpu. I never really thought about it but would this be normal since really when shutting down only the primary power supply would shut off. I guess i could understand it as well if i had power connections to the motherboard from the second power supply but its only powering a gpu. Thoughts from my fellow forum members would be welcome.  This is the power supply switch i am using    https://www.ebay.com/itm/Add2PSU-Multiple-Power-Supply-Adapter-Run-Multiple-PC-Computer-PSU-Together/121956345611?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649                        when starting the computer, it works fine without issues when pressing the power button on the pc both power supplies start up at exactly the same time and both gpu's light up and the oled screens match in sync like they are supposed to, just the shutting down thats not complete. 

I have used an adapter like that in past builds.  Works great.

sparetimepc

Grey_Beard
I have used an adapter like that in past builds.  Works great.

You talking about the one that @bob16314 is showing?

Yes. Used it on a number of multiple GPU set ups in the past. Turns both on and off when you use the power button for the PC.