rhkramer wrote: > +1. A voltage controlled DC (computer fan) motor can be > controlled / regulated down to about 40% of full rated speed > (depending on the motor). A PWM (computer fan) motor can be > controlled down to about 20% of full rated speed.
I found some web pages that describe the individual fans. fan front low be quiet! Shadow Wings 2 140 mm [1] front high be quiet! Shadow Wings 2 140 mm CPU cooling tower be quiet! Pure Wings 2 120 mm (2) [2] rear Corsair 120 mm projector extra fractal Silent Series R3 140 mm [3] (connectors are 3-pin) [1] https://www.bequiet.com/en/casefans/shadow-wings-2/1620 "available with or without PWM control" [2] https://www.bequiet.com/en/casefans/449 "Fan speed @ 100% PWM / 12V: 1500 RPM" [3] https://www.fractal-design.com/products/fans/silent/silent-series-r3-140mm/black/ (Doesn't mention PWM.) https://dataswamp.org/~incal/ebchw/COMPUTER -- underground experts united https://dataswamp.org/~incal