On 2021-08-22 4:23 a.m., to...@tuxteam.de wrote: > On Sun, Aug 22, 2021 at 09:56:19AM +0200, Emanuel Berg wrote: > > [...] >> Fan connectors are 3-pin! > > Aha. So there's a chance. > > But still your drivers don't seem to play along. Hm. > > Ahem... it seems I was wrong: the third pin in three-pin conector seems > to be tacho (i.e. speed feedback), not PWM [1]. The PWM is the fourth > pin, which on a three-pin connector is the... oh, wait. > > Whether three-pin fans can be even be RPM controlled is an open question > (the DC feed could be modulated, I guess, but I don't know whether it > is actually done). > And there's the question of the system used to drive the fan. Could be proprietary and not open.
On budget motherboard, saving a chip is saving some cash and making profit. The significant difference in practice is that 4-pin fans allow for RPM to change based on the need for cooling temperature, this reduces noise and power consumption. While 3-pin can control the voltage, but the voltage can't turn to change the fan RPM at all and accurate as much as 4 pin fans. [2] What Is the Difference Between Three- and Four-Pin CPU Fans? [3] > Cheers > > [1] https://en.wikipedia.org/wiki/Computer_fan#Connectors > > - t > [2] https://digitalworld839.com/3-pin-vs-4-pin-fan-difference-between/ [3] https://www.howtogeek.com/273575/what-is-the-difference-between-three-and-four-pin-cpu-fans/ -- Polyna-Maude R.-Summerside -Be smart, Be wise, Support opensource development
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