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AIO header info for Asus Gene VII

gmariust
Level 7
Hello fellow ROG-ers, recently I have purchased my first AIO, Arctic Liquid Freezer 120 for cooling an I7-4790K on an Asus Z97 Gene VII motherboard (bios 3003).
Arctic recommends to daisy chain the pump->fan1->fan2->motherboard. It does not explain too much to which header it should be plugged in, hence my questions.
The pump is 3 pin and the fans are 4 pin. In this way, Arctic recommended, both fans and the pump
are running at the speed of the fans, ~1400 RPM. Reading through internet I saw mostly that everyone from other AIO builders like Corsair
and also custom loop providers like EK, the pump should be running alone on a header to benefit from
the max speed , for a better liquid flow inside the radiator and to not be affected by the variations of the fans due temperature.
While this seem to make sense, some new z170 motherboards have a special dedicated pump header called w_header, my Gene VII does not have one.
If I run the 2 fans daisy-chained and plugged into cpu_fan they run also at ~1400 RPM while the pump plugged into cpu_opt runs at ~5000 RPM.
Here comes the questions :
1. Is the cpu_opt able to provide 12v, or is any real danger that it can fry the motherboard if used like this for a long time ?
2. As the warranty of the AIO is 2 years can pump itself to die much sooner if is running at 5000 RPM instead of 1400 RPM via recommended method?
Thanks for any input
M.
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4 REPLIES 4

Chino
Level 15
I'd connect the pump to a CHA header and the two fans to the CPU_FAN header. The fan headers are rated at 1A maximum so it'd be good measure to make sure your pump and fans don't exceed that limit.

Pandur
Level 11
I have run AIO kits with the pump connected to cpu_opt and the fans to cpu_fan before and this worked perfectly for me. Pump would run full speed all the time from the opt header and the cpu_fan header would regulate the fans according to cpu temp.
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Hi, thank you for suggestions, I see now only one problem, if the pump dies for any reason if linked to anything else than cpu_fan you will not be aware of it. On PSU molex you have no notification
(there's no led on the pump).

Pandur
Level 11
Your motherboard should have the option to set fan failure alarms for all chassis headers as well as the cpu header. And if you run a temp monitor program of some sort you will see that the temps are to high if the pump fails. I had one AIO pump fail before and the computer was stable unless I put a heavy load on the cpu, then the temp would skyrocket and it would crash after a few minutes. So a dead AIO pump should not kill your cpu right away unless you disable all safeguards and run it at max turbo 24/7.
ROG Crosshair VIII Dark Hero
AMD Ryzen 7 5800X3D
32GB G.Skill Trident Z Royal
2TB WB Black SN850X
Soundblaster ZxR