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I couldn't find any certifications, but wikipedia provides a partial answer: https://en.wikipedia.org/wiki/Coaxial_power_connector#Connector_sizes


Contact ratings commonly vary from unspecified up to 5 amperes (11 amperes for special high-power versions). Voltage is often unspecified, but may be up to 48V with 12V typical. The smaller types usually have lower current and voltage ratings.


I would be wary using a barrel connector for a anything with a dedicated graphics card and more than a simple cpu. I remember reading a german review of the streacom picopsu powering an i7, where the barrel connection reached an alarming temperature of over 100° C with voltage drops as result. I'll try to find is again.


EDIT: here you go: https://www.computerbase.de/2013-04/streacom-nano-150-watt-pico-netzteil-test/7/