Here's what TrueAchievements had to say about Noise Levels, Xbox One X compared to Xbox One (launch model):
Noise Levels
What about noise? We found that the fan noise on the Xbox One X was slightly louder when the console was under load — 50 decibels compared to 46 — but conversely quieter when the fan wasn’t running at 42 decibels compared to 44. The fan is not constantly running during gameplay, so there’s an initial period of noise for the first couple of minutes of a game, but as soon as that stops then the console is relatively quiet.
Across all of those tests, the Xbox One X maxed out at 56.4 decibels, compared to 55.5 decibels for the old console. However, over a ten-minute period, we recorded a slightly lower average decibel score on the new console: 47.3 decibels against 48.4 on the original Xbox One.
Noise Levels
What about noise? We found that the fan noise on the Xbox One X was slightly louder when the console was under load — 50 decibels compared to 46 — but conversely quieter when the fan wasn’t running at 42 decibels compared to 44. The fan is not constantly running during gameplay, so there’s an initial period of noise for the first couple of minutes of a game, but as soon as that stops then the console is relatively quiet.
Across all of those tests, the Xbox One X maxed out at 56.4 decibels, compared to 55.5 decibels for the old console. However, over a ten-minute period, we recorded a slightly lower average decibel score on the new console: 47.3 decibels against 48.4 on the original Xbox One.