Desktop makers are as open about noise as laptop makers. Apple, Dell, HP and Lenovo publish acoustic declarations for current desktops and all-in-ones under ISO 9296, ISO 7779 and the ECMA standards, in the same support pages, regulatory datasheets and ECO declarations used in our laptop guide.
Nineteen current US desktops carry those declarations. At idle, mean sound power runs from 1.5 bels for the Mac Studio to 3.7 for Dell's budget tower; upper limit figures run from 2.04 bels for a Lenovo all-in-one to 3.1.
Two conventions again
Apple and Dell declare the mean sound power, LWA,m, and print the statistical adder KV separately. HP and Lenovo declare an upper limit, LWAd or LWA,c, with the adder built in. The two cannot be ranked together, so each pick says which convention it uses. The sound power vs sound pressure explainer covers bels and KV.
Load is where desktops differ
At idle, most desktops declare within a bel of each other. Under load the spread widens, but only Dell and Lenovo declare a processor load mode. Dell's Pro Precision 7 T1 workstation declares 2.9 bels at idle and 2.9 with its Core Ultra 9 fully stressed. Dell's Pro Tower, on the same regulatory platform, declares 2.8 at idle and 3.7 under CPU stress. Lenovo's neo 50a 27 all-in-one rises only from 2.6 to 2.7.
Apple declares idle and a web browsing test, and HP declares idle and disk activity. Neither says what its desktops sound like under full load.
Smaller is not quieter
Small form factor desktops declare louder than towers here. Dell's Pro Slim declares 3.24 bels at idle against 2.8 for the Pro Tower. Lenovo's small M70s declares 3.1 against 3 for its M90t tower. Small cases carry small fans that spin faster. For the quietest compact option, our mini PC guide goes smaller still, where the Mac mini declares even lower.
The optical drive penalty
Dell's workstation datasheet includes an optical drive mode: 4.9 bels and 39.1 dB at the operator position, against 2.9 bels at idle. It is the loudest figure in any desktop declaration here. Anyone who still needs discs and wants quiet should use an external drive only when needed.
Price notes and gaps
HP's store list prices on business desktops run far above street: the EliteDesk 8 SFF lists at $3,880 on HP's store while Amazon sellers offer it for much less. HP's consumer OmniDesk and OmniStudio pages publish no noise figure. Apple's Mac Pro is discontinued, and Dell has no current XPS desktop.
We did not measure any of these desktops. Every figure is the maker's own, quoted as published, with the standard, mode, position and KV wherever the maker gave them.
