Arctic Liquid Freezer II AIO - No Fan speed reported?

Monkeyspaz5000 · 23 Dec 2021 at 17:06

Hi folks.

I just installed this in my system.
It has one connector which I have connected to the CPU fan connector.

The 3 stock fans then connect to the bale that comes off the tubing at the radiator.

The VRM fan is spinning and the 3No fans are spinning, but the motherboard bios doesn't report any speed.
My thoughts are - how can the fans be controlled if no speed is reported?

I'm tempted to simply connect the fans to the motherboard and then have the pump header on the motherboard.

Searching online, others mention the 0RPM in the bios - but no information or fix.

Any help/input appreciated.

Monkeyspaz5000 · 23 Dec 2021 at 21:30

Grandmaster Fap! said:
My Freezer 280 reads fine through the CPU header, it may mean nothing but is your cpu header set to PWM or voltage?

Set to PWM.
I’m going to connect the fans to the CPU header separately and the pump to the pump header simply for peace of mind.

Some others seem to have the same issue for some reason.

Monkeyspaz5000 · 24 Dec 2021 at 13:04

Grandmaster Fap! said:
Hope its not some design fault as the coolers are amazing. If you can split pump and fans then go for it, hope it works!

If I search online there are a few people saying the same things, but with no fix.

A pain, but not a massive issue I'll connect the pump to the AIO header and run full speed.
I'll then simply connect the fans to the motherboard so I can control those.

Monkeyspaz5000 · 24 Dec 2021 at 22:48

Vimes said:
Altho not directly related I have some vague memories of the first Gen AF II that if you split the fans and the pump they would both give an RPM readout if connected to the appropriate header on the motherboard.
From the second revision onwards (mine is REV 4) the pump no longer carries a RPM signal and so is not readable any more.
Not sure tho why the plug from the fan / pump header is not giving an RPM output on your motherboard, do you see it is you connect it to another header, just to try...?
What AIO is it, the 360 or the 420...? Could the issue be with your motherboard...? What is that btw..?

Mine is also Rev4.
Plugged into the CPU1 header (I think I only have 1 cpu fan header).

Motherboard is MSI MPG Z690 Force.

I have the 360.

I'm assuming yours is exactly like mine.
There's 1 cable that comes off the pump to go to the motherboard.
The fans then connect to the cable that comes out where the tubes are at the radiator.

I haven't tried on another header, but as it is on the CPU header there is 0 reading - I have the header set to PWM.

My main concern is that it isn't actually being controlled in any way at the moment - hence why I was thinking of connecting to the pump header and then connecting the fans separately to the CPU header to be controlled.

I'll try another header tomorrow at some point out of sheer curiousity.

Monkeyspaz5000 · 27 Dec 2021 at 00:37

Finally figured it out.
The default fan profile for the CPU temp (in bios/idle) was so low that although spinning, the motherboard wouldn't display it.

After fiddling around and increasing this, I noticed the speed was then being measured by the motherboard fine.
A quick and dirty fan profile is now setup and I'm glad to say that all seems ok.

I initially swapped the AIO to the pump header which read a speed and then connected a fan to the CPU header, which read a speed which led me to fiddling around.

Cheers chaps - I thought I was going to have to go get a different cooler!!