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Fans and Fan Headers on Mobo - Googled it and couldnt find a recent discusion

post #1 of 6
Thread Starter 
I am putting 2 360mm radiators in my build with ML120 Pro fans (corsair). They show a power draw of .218 amps, and I think the enthusiast mobo fan headers put out 1 amp.

Would a 3 to 1 splitter work fine, or should it be powered?
post #2 of 6
Depends on the motherboard. Most fan headers can take 1A, while some boards have headers that can do up to 2A. Tell us your motherboard model.
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Magicbox
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post #3 of 6
Thread Starter 
Probably one of the ASUS ROG motherboards. So my question is essentially, when a power draw is listed in FAN specs, such as "Power Draw 0.225 A", is that an average or peak (highest RPM)?
post #4 of 6
Usually it's the nominal rating at the highest rpm. But keep in mind that start-up current is often higher. I never run more than two medium-high speed fans per header when using a simple splitter, just to be safe. Better to use a powered splitter if you want to hook up multiple fans to a single header.
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post #5 of 6
I think this review may answer your question. http://thermalbench.com/2016/07/12/corsair-ml120-pro-120-mm-fan/

Page 2 -
Quote:
Rated at 0.225 A (2.7 W on the 12 VDC rail) for the ML120 Pro non LED and 0.299 A (3.6 W) for the ML120 Pro LED fans, these should be handled appropriately when it comes to powering multiple such fans. In practice, these fans drew an average operation current draw of 0.131 A (1.57 W) for the ML120 Pro non LED and 0.172 A (2 W) for the ML120 Pro LED fans each and a single 1 A motherboard fan header will be able to power them easily- perhaps even 2 or 3. A powered PWM splitter is recommended if using 4 or more fans on the same header, and there is another reason to keep 3-4 fans per header as it is which we will get to soon.

So 3 should be fine on one header. It seems the power draw, in practice is, less than stated on the back of the fan. It may be the start up current draw that is labelled.
post #6 of 6
Quote:
Originally Posted by Amaskedman View Post

I am putting 2 360mm radiators in my build with ML120 Pro fans (corsair). They show a power draw of .218 amps, and I think the enthusiast mobo fan headers put out 1 amp.

Would a 3 to 1 splitter work fine, or should it be powered?
Sense the ML120 Pro is PWM use a 4-way PWM splitter with PSU power like Gelid sell. You can monitor one fan's speed and send PWM signal to all fans from motherboard fan header while power them with PSU so no worries about overloading header.
https://www.novatech.co.uk/products/gelid-solutions-1-to-4-pwm-fan-splitter/4897025780460.html?gclid=EAIaIQobChMI4M6Nv5LT1wIVYrXtCh2UKweZEAQYASABEgLYrvD_BwE#utm_source=google&utm_medium=base&utm_campaign=products

Or use a PWM splitter hub like Silverstonetec and Swiftech sell that control 8 fans with PSU power.
http://silverstonetek.com/product.php?pid=526&area=en

Quote:
Originally Posted by latelesley View Post

I think this review may answer your question. http://thermalbench.com/2016/07/12/corsair-ml120-pro-120-mm-fan/

Page 2 -
So 3 should be fine on one header. It seems the power draw, in practice is, less than stated on the back of the fan. It may be the start up current draw that is labelled.
But is that amp rating running load or start-up / stalled load? Most fan specs are running load and startup / stall load rating can easily be 3 times running load rating. that is why it's better to use PWM splitter / hubs that use PWM power. that way there is no way to overload the fan header and we can run up to 8 or so fans on a single PWM signal. tongue.gif
Edited by doyll - 11/22/17 at 1:49pm
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