Fact is the Opi5, just like many other SBCs actually prefer being fed with slight over-voltage to compensate for losses across wiring and connectors.   This is why, for example, the official PSU from RaspberryPi is labeled with 5.1 volts output and the official PSU from Orangepi, even though labaled as 5V actually outputs around 5.2 volts. The reason is that with such low voltages losses as mentioned across wiring and connectors become significant and the voltage will drop even fu