- Jun 30, 2004
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Sometimes -- many times -- I seek "second opinions." I do this with my taxes, and once I proved the tax advisor wrong, and myself right. But electronics is such a weak suite in the stack of my 68-year-old memory, that I only have an idea of watts, amps and volts, resistance, impedance or capacitance -- and that trail gets weaker and spottier as your eyes move across the page. Maybe I actually learned something in 2nd-semester freshman physics. About 50 years ago . . .
THE SCENARIO: Your motherboard has a set of PWM, PWM/3-pin, and 3-pin-voltage-controlled fan ports. You have three fans arrayed in an air-cannon and all in sequence, pusher-fan greater CFM by about 20 but wider (140mm vs 120) than the others, middle-fan rated at 80, puller-fan rated at maybe 78.
You need to use three more fans in the system: two 140mm 3-pins which can be later replaced by PWMs, and one CoolerMaster Stacker ~12" by ~2.5"sq. "Crossflow" fan which is also 3-pin. I may post another thread on that as a separate topic. Not at the moment.
You have two CHA_FAN[n] ports, each separately controllable with its own fan curve. You want to run three fans on two ports. You have prepared a splitter that routes the tach wire from only one of a twin or triplet 3-pin devices, with the -/+ power wires connected in parallel.
The 140-3-pin and Crossflow fans are rated at an amperage of 0.25A across the board without exception.
If you only need to monitor a single fan of each type -- PWM or 3-pin from either /both ports-- what drawbacks would there be in using this wiring scheme to avoid adding an aftermarket fan-controller to the equation?
Have I got this right? Will it work right? I may have done it once and it seemed to work.
THE SCENARIO: Your motherboard has a set of PWM, PWM/3-pin, and 3-pin-voltage-controlled fan ports. You have three fans arrayed in an air-cannon and all in sequence, pusher-fan greater CFM by about 20 but wider (140mm vs 120) than the others, middle-fan rated at 80, puller-fan rated at maybe 78.
You need to use three more fans in the system: two 140mm 3-pins which can be later replaced by PWMs, and one CoolerMaster Stacker ~12" by ~2.5"sq. "Crossflow" fan which is also 3-pin. I may post another thread on that as a separate topic. Not at the moment.
You have two CHA_FAN[n] ports, each separately controllable with its own fan curve. You want to run three fans on two ports. You have prepared a splitter that routes the tach wire from only one of a twin or triplet 3-pin devices, with the -/+ power wires connected in parallel.
The 140-3-pin and Crossflow fans are rated at an amperage of 0.25A across the board without exception.
If you only need to monitor a single fan of each type -- PWM or 3-pin from either /both ports-- what drawbacks would there be in using this wiring scheme to avoid adding an aftermarket fan-controller to the equation?
Have I got this right? Will it work right? I may have done it once and it seemed to work.
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