David Christensen wrote: > The motherboard user's manual says all of the fan connectors > are 4-pin.
Indeed, I looked at one of the fan's wires instead of the connector :$ > Changing the supply voltage of a old-school 2-wire fan will > change the speed. These typically have 4-pin power supply > Molex connectors and/or 2-pin 0.1" general electronics > connectors. I connect these to Molex connectors or manual > speed controllers, paying attention to alignment/polarity. > > Changing the supply voltage of a 3-pin fan, where the 3rd > wire is tachometer feedback, will change the speed. > I connect these to motherboard 3-pin and 4-pin fan > connectors, paying attention to the alignment tab. > > Changing the supply voltage of a 4-pin fan, where the 3rd > wire is tachometer feedback and the 4th wire is PWM speed > control, may change the fan speed, may cause the electronics > onboard the fan assembly to malfunction or fail, and/or may > cause the electronics feeding the fan to malfunction or > fail. I connect these to motherboard 4-pin fan connectors, > paying attention to the alignment tab. > > Be careful when making connections. I once mis-aligned > a 2.5" IDE HDD 40-pin power/signal adapter cable to a 2.5" > IDE HDD and was off by one row. When I energized the power > supply, the result was a short-circuit, smoked insulation, > and permanently damaged hardware! :) -- underground experts united https://dataswamp.org/~incal
