If the spec is correct the voltage accuracy of the PSU is ±5% and the output ripples is 120mVpp which is rather high for a good PSU. There are 2 condensers soldered to the HDD power cord to compensate for that and guard the HDD drives (kind of ugly, yet a cheap solution), but isn't it too much for the components of the PCB?
https://wiki.kobol.io/helios64/files/psu/YHY_12V_PSU_Specification.pdf