dual CPU cooler fans- which headers to use?

ik9000 · 23 Feb 2020 at 17:55

Just installed Noctua nh-14s with two fans but the box didn't come with y-splitter. Can I run one fan off cpu-fan (pwm) header and one off pump-fan header (also pwm) or do they both need to share the same header? Shouldn't be a current issue combining them, just I don't have the splitter cable and don't want the delay of ordering one if it's not necessary.

Mobo is MSi x570 Ace.
Front fan noctua nf-a15
back fan akasa viper-r ak-fn073

LuckyBenski · 23 Feb 2020 at 19:07

There's no problem running off separate headers. It's probably best to set them to the same fan curve to avoid weird effects if they're running at different speeds.

UnworthyBean · 23 Feb 2020 at 19:12

As above, they'll run at different speeds as they'll be based off different temps but they'll work.

I'd still recommend getting a splitter so it's hassle free in future.

doyll · 24 Feb 2020 at 18:48

You can do that, or buy a simple PWM fan splitter like linked below so both have same control. You dont' need both fans running. Single fan cools withing 1-3c of 2 fans, so no big deal if you order a splitter.
https://www.overclockers.co.uk/ek-water-blocks-ek-cable-y-splitter-2-fan-pwm-10cm-wc-551-ek.html

ik9000 · 25 Feb 2020 at 13:36

doyll said:
You can do that, or buy a simple PWM fan splitter like linked below so both have same control. You dont' need both fans running. Single fan cools withing 1-3c of 2 fans, so no big deal if you order a splitter.
https://www.overclockers.co.uk/ek-water-blocks-ek-cable-y-splitter-2-fan-pwm-10cm-wc-551-ek.html

Thanks

that is exactly what I ordered yesterday and should be arriving later today

It worked ok off the pump header once I adjusted the fan profile to link to the cpu sensor.