I want to control my fan speeds via software. Including radiator fans and case fans, I will have 14 total fans.
My proposed plan is below, but first some specs and background info:
My motherboard (ASUS z87 Deluxe) has the following 6 fan headers (specs here, page 53): CPU_FAN, CPU_OPT, CHA_FAN1, CHA_FAN2, CHA_FAN3, CHA_FAN4.
Only the CPU_FAN header is fully PWM capable, according to this source. CPU_OPT has PWM but it cannot be controlled directly, it simply mirrors the settings of the CPU_FAN header. The other 4 headers are voltage control only, even though they have 4 pins.
The CPU_FAN header supports up to 1A (12W) power draw. Sources on the ASUS forum say that this applies to the other headers as well.
I'm getting the Corsair 900D case and plan to put a 120.4 radiator up top, another 120.4 radiator on the bottom on one side, and a 120.2 radiator on the bottom on the other side (next to the power supply).
So that's 10 radiator fans, plus the 4 case fans, and I also want to control my PWM pump.
With the above info in mind, my plan is the following:
CPU_FAN: connect the pump's PWM and RPM monitoring connector (it's a green and blue wire only, in a 4-pin fan connector). The pump will be powered via a molex connector to the power supply.
CPU_OP: nothing connected
For the radiator fans, I will choose fans that have a maximum current draw of 0.20A or less, so that the maximum for 4 fans together would be 0.8A. I will also have to replace the stock case fans with fans that draw 0.20A or less for the same reason (stock fans draw 0.3A each I think, so 4 together would be too much).
Is this a viable plan?
I'm assuming a (1.0A-0.8A = 0.2A, or about 20%) margin for error will be enough. What do you think? Anyone have a setup like this or done something like this before? I'd really appreciate your input!!
It's unfortunate that I can't simply use a PWM splitter cable like this because the motherboard headers aren't actually PWM capable. And I haven't found a fan controller capable of controlling the voltages via software. If you have other options, I'd love to hear them!
By the way, I'm posting this in the water cooling forum because I figured watercooling would be the main reason for needing to control this many fans, and more people here might have some experience with this sort of setup.