The authors of the portal Les Numériques found that the PlayStation 5 of the same revision (CFI-1016A) differ in noise level.
To understand the reasons, experts disassembled the consoles, found that they use different coolers.
From the site's investigation, it became clear that at least three types of fans are used in the production of the console. The authors found two in 7 consoles that they managed to disassemble, while the last one (the one that was shown at the system analysis) they did not find.
It is impossible to understand which cooler is built into the console. This seems to happen randomly. But don't worry too much. The difference in noise is modest: after 15 minutes in the remake of Demon's Souls, one console produced 39 decibels and the other 43.
In general, journalists note that there is no need to worry, let alone panic. The PS5 is still much quieter than the PS4 and PS4 Pro, some of which were so noisy in heavy gaming that by the end of a generation they were compared to jet planes.