Jun 23, 2020 · As it stands, QNAP state that the TS-253D generates 17.1db(A) when in full use and populate with WD Red 2TBs, a pinch higher than the 19.8 dB (A) rating on the Synology DS720+, but this is alot to do with a larger degree of hardware on the QNAP and how those additional components can generate noise.