Need some help with wiring my case fans

[Vladimir Enev]

So I have 7 fans in total on my pc, 3 intakes, 3 exhaust and 1 cpu fan.

I know I should plug the cpu fan in the cpu fan header.

The other 6 fans are 3-pin DC fans and I intend to plug the 3 intakes into a pwm hub (splitter), connected to a system fan header(DC), and the 3 exhaust into another pwm hub connected to a different system fan header.

My questions are the following:

1. Can I control the speed of the 3-pin DC fans as usual in my BIOS when they're wired through the pwm hub?

2. Which mode should I use in order to control them through the pwm hub - PWM mode or DC mode?

My issue is I can control one 3-pin fan totally fine if I plug it into the sysfan header in DC mode, but all the splitter hubs I see are 4-pin pwm and I don't know if I would still be able to control the fans through it.

[LogicalDrm]

1. This depends on mobo, but most can control DC fans without issues. Don't use powered hubs unless you find one which can convert PWM signal to DC (I think Silverstone has one).

2. DC. You can't magically make DC fan work as PWM. It would need hub with controller board to convert signal (the Silverstone etc. hub). If you use PWM mode on DC fans, fans will run at 100% speed all the time.

 

I would suggest that you use 3-way 3pin splitters, if you can find any. PWMs work too, if you can force mobo to DC control. Two of them for both intake and exhaust combos. Unless you have some high powered or older fans, they will be well enough in 1A max power draw for mobo headers.