Question Fractal Torrent Fan Hub question

[donnieberry]

Fractal Torrent Manual (Page 18 for Fan Hub)

I am new to PC building so I just want to understand something. Is the below correct? (Sorry if I am completely wrong, I just want to understand!!)

The fan hub calls for FAN1 to have the CPU fan plugged directly into it, allowing the fan hub to read the temps of the CPU. The POWER connector will power the CPU fan.

The confusing part for me is, a guy built my PC for me and my fan hub is coming up under System Fan 5, which I assume is SYS_FAN5 on my motherboard.

So, what exactly do I/can I plug into FAN1?

Can somebody explain to me how this works? I don't want to open my PC and start messing with cables in case its a easy explanation!

 

[dwd999]

Fractal Torrent Manual (Page 18 for Fan Hub)

I am new to PC building so I just want to understand something. Is the below correct? (Sorry if I am completely wrong, I just want to understand!!)

The fan hub calls for FAN1 to have the CPU fan plugged directly into it, allowing the fan hub to read the temps of the CPU. The POWER connector will power the CPU fan.

The confusing part for me is, a guy built my PC for me and my fan hub is coming up under System Fan 5, which I assume is SYS_FAN5 on my motherboard.

So, what exactly do I/can I plug into FAN1?

Can somebody explain to me how this works? I don't want to open my PC and start messing with cables in case its a easy explanation!

It would depend on how your motherboard is designed so it would help if you could tell us the make and model. If possible any information you have about how the bios controls the fan connectors would help.

For example, on my motherboard which is an ASUS Z790 Strix-E all of the fan connectors can be set to respond based on the cpu temperature. The primary difference between the connectors identified as cpu and cpu-opt and the connectors identified as sys_fans is in the length of time before the fan speed increases or decreases, the step up time. For the cpu labelled connectors the minimum is something like step-up time is 2.1 seconds before the cpu fan speeds up. For the sys_fans the minimum is something like 12 seconds. So the cpu labelled connectors are quicker and more responsive to changes in the cpu temperature. I would say that the cpu and cpu_opt fans should always be connected to the motherboard cpu and cpu_opt connectors to ensure the fastest response to increases in cpu temps. Some motherboards like mine also support the sys_fan connectors making changes based on motherboard temperatures, not cpu, which would make sys_fan response even slower or not change the sys_fan speeds at all since motherboard temps really don't change that much. But in the end I rely on the cpu and cpu_opt fans being connected directly to the motherboard cpu and cpu_opt connectors for best and safest response. On the computers I've built I've never used any fan hub included in a case. That's just my opinion.

The diagram in the manual is definitely confusing because it lacks sufficient text explaining what the case designers are trying to achieve. It may simply be that they want to ensure that all of the fans in the case to respond as quickly as possible to changes in cpu temps. Part of the problem is that with multiple fans connected to a hub like that only 1 rpm value can be reported to the motherboard.