There are also 5.25" fan controllers with nobs on them or a touchscreen but I hear you can't set fan curves on them and you have to keep turning the nobs to increase fan speed which is hard because my case has a door to cover the 5.25" bays and I have to keep opening it.
Is there a product or combination of parts that will do this I originally asked this on Super User, but it was deemed more appropriate here due to the involvement of DIY electronics. I looked at pwm fan hubs but they all seem to run the fans at 100% speed because they don't plug into the motherboard and are only plugged into power. ThreeBulls PWM Fan Hub, PC CPU Cooling 4 PIN/3PIN Fan Power Cable Hub Splitter Adapter Sleeved PWM Case Fan Splitter for 12V Desktop Computer Cooler Case Fans 1 to 5 Way (15.7 Inch) Features : Excellent 4-pin PWM 1 to 5 splitter fan power supply extension cable for PC computer motherboard fans, make you easier diy PC computer case. The motherboard is able to control 4-wire fans using PWM, and 3-wire fans using DC voltage level. I at first thought of getting a splitter to split the cpu 4 pin but that would mean 4 fans would be connected to it (cpu fan and 3 case fans) and I don't want to overload the 4 pin header as I heard daisy chaining too many fans to one header can damage the header. I plan on building a pc with an asus p6t x58 motherboard and a xeon x5675 (These cpus are awesome they are like $25 and can handle a 2070 super/1080 ti) The only issue is that all the fan headers except the cpu fan header are 3 pin only. Most motherboards have only one system fan header and when you have four fans to connect to the motherboard you can use this cable.
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