A mini PC sits on the desk, at arm's length from your ears, running all day. This category also contains the single best documented product on this entire site, the most complete disclosure regression we have seen, and a number that one brand prints on every machine it sells regardless of what is inside.
We read spec pages, QuickSpecs, regulatory datasheets and eco declarations for twenty machines from nine makers. Nineteen carry a number or a declared value; one earns its place by having no fan at all.
Our 7 picks are listed above, with full specifications for each.
Declared figures. Apple, HP, Dell and Lenovo publish noise the way the standards intend: sound power in bels and sound pressure at the operator position in dB, under ECMA-109 or ISO 9296, with the test method (ISO 7779) and sometimes the operating modes (ECMA-74) named, and the tested configuration listed. These produce numbers like 4, 15.4, 17 and 21 dB.
Lab figures. Minisforum and GEEKOM measure in their own labs, at 50 cm where stated, with no standard. These produce numbers like 27, 28 and 32 dB.
The second family is not that much louder. It is measured closer, under conditions nobody outside the maker can reproduce. Rank machines within a family, never across the two. For the general problem, see why you cannot compare dB ratings across brands.
Apple wrote the best spec sheet on this site, and it still disagrees with itself
The Mac mini's acoustic declaration gives sound power of 1.3 bels with the statistical adder printed beside it, and 4 dB at the operator position, at idle and under a wireless web load, in accordance with ECMA-109. That is a named standard, both quantities, two load states, and the rounding rules stated. Nothing else we have covered, across every guide on this site, is documented this completely.
Apple's own tech specs page describes the same machine as "5 dBA at idle".
Four and five round differently out of the same measurement, and a decibel is within any honest margin. But it is worth pausing on: the best disclosed product we have ever covered still cannot show you the same number twice. Every figure in this guide deserves at least that much skepticism.
One number, every machine
Beelink publishes "32dB" for the EQ14, a 15 W Intel N150 machine. And for the EQ Mini. And for the SER9 Pro with a Ryzen AI 9. And for the GTi15 Ultra, a 140 W class machine with a vapor chamber.
No load state, no distance, no standard, and no acknowledgment that a 15 W chip and a 140 W chip cannot plausibly share a noise figure. Whatever 32dB is, it is a brand asset rather than a measurement, and all four machines sit in our also considered list saying so.
Lenovo's disclosure went backwards
The ThinkCentre M90q Gen 4 has a proper eco declaration: 3.3 bels idle, 3.6 operating, 21 and 26 dB at the operator position, ISO 9296. Its successors, Gen 5 and Gen 6, list an optional "TUV Rheinland Ultra Low Noise" certification in their spec documents and publish no number at all, 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 each generation, and it is worth saying so in public.
The ASUS ExpertCenter PN42 is fanless: a 6 W Intel N100 cooled by its case. ASUS publishes no decibel figure and instead writes that it runs "almost silently". Zotac's fanless ZBOX line does the same with "FANLESS SILENT" and no number.
"Almost" is doing honest work there. A passive machine has no fan noise, and can still produce faint coil whine under load, about which both makers are silent. We list the PN42 as a described machine rather than a ranked one, the same way our CPU cooler guide handles the fanless Noctua: the quietest option is the one with nothing to measure, bought with its limits understood.
We did not measure any of these machines. Every figure here is the maker's own, quoted as published, with the quantity, condition and standard attached wherever the maker attached one.
