[SOLVED] Do I plug the fan hub to the CPU Fan or the SYS Fan header?

[franco2600]

My mobo only has 1 sys fan header and 1 CPU fan header. I'm wondering which of these two should I plug the hub to. I'm extremely new to this so thank you in advance. This is the fan hub btw https://shopee.ph/product/116323173/1956825485?smtt=0.0.9

The mobo is gigabyte b450m ds3h, I was planning to install 5 case fans, 2 front, 2 top and the rear exhaust then I just found out that the mobo only has one sys fan header.

 

[Traditore]

it has instructions on the page you linked: "PWM interface is connected to CPU FAN interface on motherboard". So yes, you plug the hub's PWM into motherboard CPU connector. Than you connect your CPU fan to "CPU" slot on the hub, all the other fans to whichever slot on the hub.

 

[Paperdoc]

I disagree.

There really in only ONE reason that the Hub has one of its ports (the orange one) designated for the CPU cooler. On some earlier mobos ONLY the CPU_FAN header could supply the PWM signal on Pin #4, and that is REQUIRED for this Hub and its fans to work. So telling you to hook it up that way guaranteed it would do its job.

OP, your mobo CAN use the new PWM Mode (that is, it WILL put out the PWM signal etc.) on BOTH of its fan headers - you just have to be sure the headers are configured that way. So you can leave your CPU cooler connected to the CPU_FAN header, and then connect this Hub to your SYS_FAN1 header. But be SURE that all of the FANS you add are of the 4-pin (PWM) style, because only that fan type can be used with this Hub and a PWM signal from the mobo. Then, be sure also to have one of those case fans plugged into the orange Hub port #5. It is the only port on the Hub that will send back to the mobo SYSFAN1 header a fan speed signal. The speeds of all the other fans on this Hub will be ignored because the mobo header can only accept ONE fan's signal. This has NO impact on ability to control fan speeds.

Once you connect the HUb and all those case fans this way, go into BIOS Setup and see the manual p. 24. Note that you must choose first which of the two mobo fan headers you are configuring. Choose the SYSFAN1 header. Set its Speed Control to Normal, Use Temperature Input to the motherboard sensor, NOT the one inside the CPU chip, Control Mode to PWM. Remember to SAVE and EXIT to save your new settings and reboot.

 

[willismatt5]

Sys fan connect CPU cooler fan to CPU fan header and hub to sys fan header


Sent from my SM-A505U using Tapatalk

 

[Paperdoc]

Thanks for Best Answer.

 

[Karadjgne]

You have 5 case fans, 1 cpu fan and 2 variable headers. If you follow directions, you'll have 6x fans all moving according to cpu temp and 1 extra header. If you follow paperdoc, you'll use both headers, the cpu fan will work by cpu temp and the 5 case fans will respond to case temps.

Considering the gpu is going to heat up the case far more than the cpu will, especially gaming, getting rid of case air according to case temps just makes so much more sense.

You Can do either way, both are correct, but paperdoc's method is simply better.