Question Running AIO pump off same header as fans

tom_taylor97

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Hello :)

So the title basically explains it all. I was lucky enough to get a 5900X and using an EK-WB 240 AIO to cool it.
I have an itx motherboard with only 2 headers and currently have 1 header for 2 case fans and the other header for the aio pump & aio fans using the noctua splitters.
My question is whether it is okay to run the pump on the same header as the fans? I've run the ryzen master stress test and seem to be maxing out around 72-75 which seems fine temps wise, just unsure of whether it will have a negative effect on the pump.

Thanks!
 

EridanusSV

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As long as its a 4pin PWM that the software or BIOS can control, then you're fine. And lifetime wise, you'd be upgrading everything before that pump even reaches half of its life.
 
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tom_taylor97

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Fan headers are not designed for connecting a lot of devices to it.
2 fans would be fine,
3 fans maybe (if total current is below 1A),
2 fans + AIO pump will most likely fry the fan header.
Are you sure? Motherboard website states up to 24W per header with over current protection. (Aorus X570 ITX)
The noctua nf-a12x25 are only supposed to draw max of 1.68W per fan
 

Phaaze88

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Those are 2A headers. It's in parentheses on the motherboard webpage.
EK AIO 240 pump input current: 0.65A, give or take 10%... so 0.72A max?
NF-A12x25 input current: 0.14A. 2x: 0.28A
0.72 + 0.28 = 1A

If your board's headers were 1A and not 2A, you would've burnt them out.
 

tom_taylor97

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It would make more sense to use molex to fan header adapter for the pump (would loose pump speed monitoring though).

Doesnt that seem somewhat pointless though? It involves 2 extra cables (1 psu & the molex adapter) in an itx build & would then lose the ability to control the pump and run at max 24/7.
Surely I am fine using the fan headers as you've just said I'm using half of the available power and at no risk of burning them out
 

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