I have no technical specifications of the psu, so also not from the amps outputs.
But based on the pin 10 3.3v and the U1 which is a MP1484.
3A, 18V, 340KHz Synchronous Rectified Step-Down Converter.

This line can tolerate 3A.

Fan, hdd etc use the 5/12v

However the input of the MP1484 is 5 to 12v, so it's a bit related.
But in that case you must also see a unstable 5 or 12v.

Q: Is there a better psu than the original clone psu?.
Depends on brand and type..
As the original dm8000hd psu from panasonic NPX654M-3 / NPX654M-4 or ETXEZ654M7F seems to be better.
But even this may fail over time use.
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Johnny B.

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