How many decibels is a quiet mini PC?
Between 4 and 21 dB for figures declared under named standards, and 27 to 32 dB for figures from the makers' own labs. Those two families do not mix.
| Machine | Maker figure | Where measured | Standard |
|---|
| Apple Mac mini | 4 dB idle, 1.3 bels | Operator position | ECMA-109 |
| Dell OptiPlex Micro 7020 | 15.4 dB idle, 2.7 bels | Operator position | ISO 9296, ISO 7779, ECMA-74 |
| HP Elite Mini 800 G9 | 17 dB idle, 2.7 bels | Operator position | ISO 7779, ISO 9296 |
| Lenovo ThinkCentre M90q Gen 4 | 21 dB idle, 3.3 bels | Operator position | ISO 9296 |
| Minisforum Elite Mini M2 Air | 27 dB idle, Silent Mode | 50 cm | None |
| GEEKOM A5 | "as low as 28dB at idle" | Not stated | None |
| Beelink, four models | "32dB" | Not stated | None |
Apple, HP, Dell and Lenovo publish noise the way the standards intend, with sound power in bels and sound pressure at the operator position in dB, under ECMA-109 or ISO 9296. They name the test method (ISO 7779), sometimes the operating modes (ECMA-74), and the configuration tested. Their results read 4, 15.4, 17 and 21 dB.
Minisforum and GEEKOM measure in their own labs, at 50 cm where stated, with no standard. Their numbers read 27, 28 and 32 dB.
The lab family is measured closer, under conditions nobody outside the maker can reproduce. Rank machines within a family and never across the two. Dell's 15.4 dB at the operator position and Minisforum's 27 dB at 50 cm, both at idle, cannot be put in order, for reasons our page on why you cannot compare dB ratings across brands sets out.
Apple declares 4 dB, and its spec page says 5 dBA
The Mac mini is declared at 4 dB at the operator position and 1.3 bels of sound power, at idle and under a wireless web load, in accordance with ECMA-109, and the declaration prints the statistical adder beside the sound power figure. That is a named standard, both quantities, two load states and the rounding rules stated. Nothing else across every guide on this site is documented this completely.
Then the tech specs page describes the same machine as "5 dBA at idle".
Four and five can round differently out of one measurement, and a decibel is within any fair margin. Still, the best disclosed product we have covered cannot show you the same number twice, and every other figure in this guide deserves at least that much skepticism. Apple's MacBooks, declared the same way, are in our laptop guide.
Beelink prints 32dB on every machine
The EQ14, a 15 W Intel N150 machine: "32dB". The EQ Mini: the same. The SER9 Pro with a Ryzen AI 9, and the GTi15 Ultra, a 140 W class machine with a vapor chamber: the same again, each with no load state, distance or standard.
A 15 W chip and a 140 W chip cannot plausibly share a noise figure, and Beelink offers no acknowledgment of that. Whatever 32dB is, it works as a brand asset rather than a measurement.
All four machines sit in the also considered list.
Lenovo's numbers stop after the M90q Gen 4
The Gen 4 has a proper eco declaration under ISO 9296: 3.3 bels idle and 3.6 operating, or 21 and 26 dB at the operator position. Gen 5 and Gen 6 publish no number at all. Their spec documents list an optional "TUV Rheinland Ultra Low Noise" certification instead, and we found no eco declaration for either.
A certification name is not nothing. But you cannot compare it, check it, or hold it beside a competitor's 17 dB. When a maker replaces figures with a logo, the buyer knows less with each generation. That deserves saying in public.
Is there a silent, fanless mini PC?
The ASUS ExpertCenter PN42 has no fan: it is a 6 W Intel N100 cooled by its case. ASUS prints no decibel figure for it, only that it runs "almost silently", and Zotac's fanless ZBOX line does much the same with "FANLESS SILENT" and no number.
"Almost" is doing careful work there. A passive machine makes no fan noise, yet it can still produce faint coil whine under load, on which both makers are silent. The PN42 is listed as a described machine rather than a ranked one, the way our CPU cooler guide handles the fanless Noctua: the quietest option is the one with nothing to measure, bought with its limits understood.
The computer is not the only noise on the desk. An ordinary mouse is loud in a quiet room because its sharp click is designed in, as our explainer on quiet mice puts it, and silent switches, scroll wheels and the lone mouse maker with published decibel figures are all covered there.
