How to build a quiet computer

1. Step 1 of 2

   Where the noise comes from

   Three sources, loudest first: fans spinning faster than they need to, turbulence from air passing obstructions, and vibration carried through the case.

   The key relationship: noise rises with fan speed far faster than linearly. A 140 mm fan at 800 rpm moves as much air as a 120 mm at 1200 rpm but is noticeably quieter. Larger fans turning slowly are therefore almost always better than small fans turning fast.

   The second consequence: surplus cooling capacity buys silence. A cooler rated for 250 W paired with a 120 W processor never has to spin up. It is the same reason choosing cooling with headroom is worth it.

2. Step 2 of 2

   What to do, in order

   30 min

   Start with fan curves in the BIOS — it costs nothing and gives the most back. Most builds are loud purely because the fans react to every momentary temperature spike. Add a response delay and flatten the curve below 60 degrees.

   Next check that no cable is catching a fan blade and that the fans are not screwed down too tightly. An overtightened screw transmits vibration straight into the case; rubber washers or slightly backing the screws off removes the hum.

   Third, replace the CPU cooler with a larger one if the current one spins fast during ordinary use. A big tower at 700 rpm is essentially inaudible.

   A spinning hard drive, if you still have one, is often the loudest thing at idle. Moving the system to NVMe removes both the noise and the vibration.

   Leave sound-dampening mats until last. They absorb high frequencies but restrict airflow, so the fans have to spin faster — the net effect is frequently nothing.

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