Ugly Things That Make a PC Quieter

Everything on this list is visually unappealing, hidden inside a case, and effective. The organising principle: it must reduce noise measurably, it must not be a fan swap chosen on a marketing figure, and it must survive an honest look at what it costs in airflow.

They are ordered by how much noise they remove per pound spent, which puts a bag of rubber washers first and the fans people usually buy first much further down.

A note on this collection: chosen on which noise source each one addresses, not on a machine measured here. See how we test.

Rubber grommets and stepped screws

A mechanical hard drive bolted into a steel cage transmits its vibration into the chassis, and a steel panel with a vibration source attached behaves as a loudspeaker.

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Full reasoning in hard drive rattle.

Intake filters

Filters do not muffle anything. They keep heatsinks clean, so fans do not have to spin faster to compensate for blocked fins — which is where most "my PC got louder" actually originates.

A PWM fan hub

Running case fans from one controlled source means they follow a sensible curve together rather than some running flat out on a fixed header.

Dampening mats, on the right panels

Bitumen sheets stuck to the inside of a large flat steel panel, and nowhere near a vent.

Where it works and where it does not: sound-dampening a PC case.

Low-noise case fans, last

Better fans, bought on airflow at a stated noise level rather than on a noise figure alone.

What was deliberately left out

Water cooling. It relocates heat rather than removing the need to move air, and a pump is an additional noise source with its own failure modes. Not wrong; a much larger decision than anything here.

Fanless power supplies and passive coolers. Genuinely silent and genuinely constrained by what they can dissipate. They belong in a build decision, not in a list of fixes for an existing machine.

Acoustic foam on the room's walls. A different problem — that is room acoustics, and it does nothing for a case radiating noise from a metre away. Do acoustic panels improve gaming audio covers it.

Anything sold on being silent without a stated airflow figure. Silence is easy to achieve by moving less air, and a machine that throttles ends up with its fans at full speed anyway.