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Hi ponnuki,
I threw the original fan out and put in a model that ist called
Noctua NF-A4x20 5V (5 volt version needed!)
I needed to make space for it because it's 20mm thick. (The NF-A4x10 5V is 10mm thick, as is the original fan, and will fit in without cutting things.)
Thing is, with this fan, I don't hear the fan motor any more (whereas the original fan's motor is noisy as hell) BUT:
I still hear the airflow, which makes a hissy sound... so the motor's buzz is eliminated, but I'm still far from "silent" operation.
I was able to reduce the noise further, by putting a 17 Ohm resistor in series to the fan, which slows the fan down. That's why I opted for the 20mm version (still enough airflow although running slow).
Still not totally happy though. Still running at too high speed. Unfortunately, with a 20 Ohm resistor, the fan won't slow down further but stops altogether.
Now:
There ist a product called NF-A4x20 5V PWM; pwm meaning you can control the speed. I mean, really control the speed, not messing around with resistors like me. This MIGHT be super interesting but I haven't checked it out.
If you experiment with the cooling, I recommend to spend a few bucks in a thermometer with an external sensor and constantly check the temperature inside the VS. I found it usually goes from 20 degrees Celsius (VS off) to 26-ish (VS running with fan). Disconnecting the fan gave me 40 degrees and still rising, let's not even think of this as an option :-)
And of course, there sure are other options than the Noctua brand. That's just what I chose... maybe the brand name made sense to me... :-)
Edited by magirusholger (06/29/21 05:21 PM)
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