QNAP SS-439 Fan Control
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Fan1 (PWM)Fan1 (RPM)Fan1 (Hz)Peak frequency (Hz)SPL at peak frequency (dB SPL RMS)SPL at rotational frequency of fan (dB SPL RMS)CPU (C)System (C)Power (C)
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000.00940200456246When replacing the QNAP OS with Debian on the SS-439 NAS, we lose temperature dependent automated control of the single internal fan.
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100.00
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20
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30Fortunately, unlike the ARM CPU based QNAP NAS devices (TS-210, TS-239, etc), we have automatic fan control settings available in the BIOS menu (accessible at boot time using the 'DEL' key when a keyboard and monitor are connected to the NAS).
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43245.4020026-8
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53565.9320026-8
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63866.4390252
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74186.97200272Rather than setting a fixed PWM (Pulse Width Modulation) value to control the fan speed, we can allow the SS-439 to automatically vary the fan speed by defining the following in the BIOS:
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84517.5221025-2
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9
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105118.5280027-2

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11System Fan1 Mode[Automatic Mode]
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125629.3780032System Temp limit of Off46
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13System Temp limit of On55
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14System Fan1 start PWM20
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15Slope8PWM
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1669011.5020036456246
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1874912.4821035These settings mean, below a system temperature of 46C, Fan1 will be off. Between system temperatures of 46C and 55C Fan1 will run at a PWM of 20. For each degree C above 55C, Fan1 PWM will increase by the slope value.
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2081013.50820354
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2286414.4019030415843These values keep fan noise low enough that the NAS cant be heard whilst in the same room, and also maintains the System temperature in a range both acceptable and making best use of the usable fan speeds.
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2594915.8221042395742
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26NB. By choosing these values, my SS-439 now idles with (Debian lmsensor reported values of) Fan1 speed:1266RPM, and temperatures of CPU:34C, System:57C, Power:42C.
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29NB. HDD temps are SDA:28C, SDB:30C, SDC:30C, SDD:31C
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30110418.40170347Slope vs PWM intervals
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31248
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32PWM range0to12763.531.7515.875
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33Range effecting FAN1 RPM4to1105326.513.25
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34Favourable temperature PWM range20to1064321.510.75
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35125220.8717038Favourable noise PWM range20to903517.58.75
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37System Temp trigger (C)PWM@Slope2PWM@Slope4PWM@Slope8
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3855222428
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3956242836
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40139123.18210431157263244
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4158283652
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4259304060
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4461344876
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4562365284
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4663385692
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47644060100
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48654264108
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49664468116
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50166627.772004417345439674672124
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51684876-
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52695080-
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53705284-
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60191231.872204720
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70219136.522605021315137
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Data
PWM v Noise
PWM v RPM
PWM v Temp