If you buy two identical coolers, they will always work synchronously...?

Question

Cooling systems

Over time, when they get noisier, will they have the same noise levels? Accurate to decebels? Or is it impossible?

Answer 1

The difference will be minimal, provided that the party is one.
But even if it is different, you will hardly find a difference by ear.

Answer 2

It all depends on many factors, on paper yes, if you take the same coolers and install them, but in reality there are many variables that can affect the result, from how it will be installed to how it will be connected and to what.

Answer 3

This is possible only with stepper motors, or with some kind of sensors and control system (as far as I know, this is not done simply for everyday things).
For ordinary coolers, there will always be a small spread, even in one batch. Stepper motors are too noisy and need a separate control board.

Answer 4

Fans will NOT ALWAYS have the same noise level.
No two devices are exactly alike. This is technologically impossible.
You can only talk about the VALUE of the difference, it can be more OR less.
If the task is to achieve synchronous operation, then I would use AC motors (NOT DC).
In this case, the synchronism of operation will be as accessible as possible, since it depends on the frequency of the alternating voltage, which is the same for both fans.
pS PWM is not suitable in this case, since it is just a kind of constant voltage supply.