I also hook up 2xAOpen 300W PSUs to power my PC.
I have no problem running them together.
Before installation, I adjusted the pots of +3.3, +5V rails to be at the same level first. Then join the green and black wires of each PSU together to have it start together. I then joined only +3.3, +5, and +12V lines from the other PSU and dummy load +5VSB using a 10 Ohm 5W resistor.
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