I have a server PSU which powers my cards and I have an ATX which powers my board. I’m having to add a second server PSU to add more cards, how do I sync all 3 power supplies?
You don’t need to sync them, as long as the atx psu is turned on last.
If you are going to attempt to sync them, there are server power supply break out boards which have additional molex/sata/fan ports on them as power sensor/on/off functions.
You would use the ATX supply as the master, and connect the Server supplies via the above options.
As Keaton shared, it is not necessary, but an available function if your management strategy requires it.
