Same Arctic fan that I have used in my Korad PSU. Although much better than stock for normal operational noise, that PSU has an idle RPM choppy pulse drive that makes it sound like a coffee grinder with suicidal tendencies when no more than 100mA current is drawn to a load so to rev it up a little. I had used a Gelid in my older DS1052E (100MHZ mod). That one was an unbearable screamer to me, had to do something about it... I basically have to change a fan every time I buy an instrument. This is becoming ridiculous. Only my Siglent PSU was nice out of the box. I wonder if all the manufacturers will ever grow up and understand that poor noise design is detrimental to a brand's quality ranking? Many times its not only the fan itself but its the positioning and the flow. Rohde & Schwarz did it right in their small scope. Better they follow them. If they even manage 50% worse than R&D they will be successful enough.
I agree with everything you say, my last instrument purchase, the SDS2072E, can only further confirm all this complaining with its piece of cr@p fan, pathetically placed in a questionable overall thermal design, that provides lot of boring noise for ridiculously small air flow in a very limited case section.
Adding this to the weirdest feeling knob encoders ever seen in a scope (come on GW), a lot worse than my ATTEN ADS1102CAL's ones, leads me to think that in this brand some design compartments are missing their targets, while other are working very good, creating the harsh contrast between good performances and so so build quality details here and there.
This Siglent generator seems a fair device, but i still have to see the rust inside
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)
Next time someone put his hands inside, please consider to take some pictures to nasty details ...
PS :dunno what version of Korad PSU are you playing with, time ago i considered them but after some youtube watching they seemed to be quite a crapfest, am i wrong ?