How does CPU fan headers work exactly?

[NadeMagnet69]

I have the arctic liquid freezer 2 240 and both its fans, well 3 counting the little one, and the pump, are all run off of 1 4 pin header. I've heard you want your pump to be running at 100%. Is that right? And if so does lowering the fans effect pump speed? Asking because I have numerous fans and that's let me tune them all down to low RPM making them silent. But I've only kinda messed with the CPU header's fan curve because I don't what what that does to the pump. So how exactly does CPU headers work?

[jaslion]

If the pump and fans are running of one header with a fan splitter then lowering fan speed lowers the pump. The pump should operate at 70% speed or higher for best efficiency. If you want to control the fans on their own and the pump just connect them to another fan header.

[Godlygamer23]

The pump is designed such that the speed of it can be adjusted, so you're not ruining anything. In this case, it's PWM, so it sends pulses of 12V power. The higher the rotational rate, the more pulses are sent.

[NadeMagnet69]

54 minutes ago, jaslion said:

If the pump and fans are running of one header with a fan splitter then lowering fan speed lowers the pump. The pump should operate at 70% speed or higher for best efficiency. If you want to control the fans on their own and the pump just connect them to another fan header.

There is no splitter. The freezer routs the fan wires down the inside of hose's braided mesh cover and runs everything into one 4 pin cable.

[NadeMagnet69]

52 minutes ago, Godlygamer23 said:

The pump is designed such that the speed of it can be adjusted, so you're not ruining anything. In this case, it's PWM, so it sends pulses of 12V power. The higher the rotational rate, the more pulses are sent.

So then would it be OK to tune it down low and not have to worry about it?

[jaslion]

20 minutes ago, NadeMagnet69 said:

There is no splitter. The freezer routs the fan wires down the inside of hose's braided mesh cover and runs everything into one 4 pin cable.

Woops didn't see it was the freezer 2 then don't worry about it. It will handle itself.

[Godlygamer23]

51 minutes ago, NadeMagnet69 said:

So then would it be OK to tune it down low and not have to worry about it?

Yeah, the pump can go down to 800RPMs.

[NadeMagnet69]

22 hours ago, Godlygamer23 said:

Yeah, the pump can go down to 800RPMs.

Okily dokily neighbor, thank you.

[NadeMagnet69]

23 hours ago, jaslion said:

Woops didn't see it was the freezer 2 then don't worry about it. It will handle itself.

Thanks