Cooling fan's splitter cable non PWM

numnum · Jan 19, 2015

Dear all,

I would like to know if a fan splitter cable would be a possible outcome for my specific problem.
I got 4 fans to set up, they are all non PWM types, one of them is supposed to fit behind a CPU watercooling radiator, the others stand alone inside the case. The problem is that my MoBo(MSIZ97m) only got 4 fan mounts, and I got 4 fans and one radiator pump.

Set-up would be:
CPUfan port 1: Fan for radiator
CPUfan port 2: Radiator pump
Additional Fan port 1: Splitter cable
Additional Fan port2: empty

The 3 other fans would be powered through the Molex on the Fan Splitter cable, and the 4-pins would be mounted on the Additional Fan port on the mobo.

I was wondering if I could use a Fan splitter cable (shown below) to be used so I can adjust the fan speed through one fan and then the others would be the same speed?

http://www.conrad.com/ce/en/product/986176/5port-Akasa-45cm-fan-splitter-cabl-4-pin
or
http://www.ekwb.com/shop/accessories/cables/ek-cable-splitter-4-fan-pwm-extended.html

Thanks in advance,
Best regards

King Kevain · Jan 19, 2015

No..CPU pump on a Chassis fan header and set to 100% in BIOS - the pump on the radiator MUST run at 100% - do not plug into CPU or CPU OPT or MOBO will think its a fan and throttle it back and will damage the pump - do not control with Software, control with BIOS so software can't.

Regarding splitter - are all fans the same? if not they will run differently, also to be PWM, MOBO detects Fan and applies voltage accordingly - multiple fans can confuse the MOBO - better to set Fan speed against temp of CPU or GPU rather than PWM.

PWM headers are meant for 1 fan only or maybe 2 fans of the exact same brand and specification.

I'd just do an intake and exhaust on static speed, then PWM the additional fan as needed - i.e off if temps are ok, 50% at mod temp of 40-50degC, 100% at +65degC

PWM aint all that when you don't have PWM fans - better to make your own fan profile or it'll get noisy.

numnum · Jan 19, 2015

Thank you for the quick answer, though there is something that bugs my mind...Asetek confirms in their instalation manual that you need to connect the fan to Rad Pump outlet and then connect this to the MoBo.
http://asetek.com/company/support/installation-guides.aspx

All the fans are thesame and non PWM.

Secondly, this isn't helping me much further. I need to know if I could use the Splitter cable from EK for example to change the speed of 3-pins (non PWM) fans.

thanks

King Kevain · Jan 20, 2015

numnum :

That's a Corsair Assembly if I've ever seen one - I take it Asetek are making the radiators? - http://asetek.com/customers/do-it-yourself.aspx

So on that model, the fan plugs into the Pump, then the Pump into the CPU Header? That's a bit crazy as the CPU Header is still regulated by the Mobo depending on CPU temp - The pumps are supposed to run at 100%, the MOBO will throttle them down if the CPU is cool and this causes the pump to strain, stress and makes noise.

Ignore the instructions - they do not factor in the Mobo or Fan control settings it may have - bluntly, they are just wrong. But don't take my word for it, take Asetek's. Have a look here - http://asetek.com/company/support/faq.aspx under "How is the pump connected to the Motherboard". You see they state the fan is supposed to operate at a fixed speed? The problem is the Mobo can still throttle the pump by decreasing the voltage therefore the pump cannot maintain the optimal pump speed, that is why you need to ensure it's set to 100% in the BIOS so full voltage is applied at all times and the pump can run itself as per it's design - further more, by setting it in the BIOS the Mobo or Software like Fan Expert can't screw around with the Pump speeds.

Just plug your fans into the CPU Header and let them be PWM'd by the CPU temp - plug the Pump into a CHA_FAN or SYS_FAN header and set it to 100% in Bios.

numnum · Jan 20, 2015

King Kevain :

numnum :

That's a Corsair Assembly if I've ever seen one - I take it Asetek are making the radiators? - http://asetek.com/customers/do-it-yourself.aspx

So on that model, the fan plugs into the Pump, then the Pump into the CPU Header? That's a bit crazy as the CPU Header is still regulated by the Mobo depending on CPU temp - The pumps are supposed to run at 100%, the MOBO will throttle them down if the CPU is cool and this causes the pump to strain, stress and makes noise.

Ignore the instructions - they do not factor in the Mobo or Fan control settings it may have - bluntly, they are just wrong. But don't take my word for it, take Asetek's. Have a look here - http://asetek.com/company/support/faq.aspx under "How is the pump connected to the Motherboard". You see they state the fan is supposed to operate at a fixed speed? The problem is the Mobo can still throttle the pump by decreasing the voltage therefore the pump cannot maintain the optimal pump speed, that is why you need to ensure it's set to 100% in the BIOS so full voltage is applied at all times and the pump can run itself as per it's design - further more, by setting it in the BIOS the Mobo or Software like Fan Expert can't screw around with the Pump speeds.

Just plug your fans into the CPU Header and let them be PWM'd by the CPU temp - plug the Pump into a CHA_FAN or SYS_FAN header and set it to 100% in Bios.

Right, well then I could solve the problem by just pluggin all the 4 fan's into the MoBO and use a Molex to 3 pin connector from the PSU directly to ensure a full 100% load to the radiator pump...I just need to check out if the Corsair AX 860 doesn't regulate it's output even when he goes into silent mode...

Thanks for the info
cheers

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