There are some minimum-load requirements on REIGN POWER's multi-output power supplies, please refer to the specification first before connecting the load. When the load condition is 5V/ 4A , 12V/ 0A , the output voltage of the 12V channel will be around 12.8V that is over the 6% of voltage deviation (12.72V) specified in the spec. sheet. If we add in the minimum load 0.2A to the 12V channel, the 12V channel will reduce to around 12.3V which is within the specification.