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Arctic Liquid Freezer II 360 - No Pump RPM

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post #1 of 27 (permalink) Old 06-06-2020, 10:14 PM - Thread Starter
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Arctic Liquid Freezer II 360 - No Pump RPM

Hello,

To fellow LFII users, have you separated the pump and radiator fan signal?

I separated the fans from the pump and connected the radiator fans to cpu fans and the cable coming from the LFII into the pump header. I am not getting any pump RPM value. I thought it may be because it could be a 3-pin “fan” but even still I should have RPM value. I have used that header with other pwm fans in the past and it read RPM no problem.

Do I have a bad unit? Do you see the same behavior?


Thanks in advance


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post #2 of 27 (permalink) Old 06-06-2020, 10:46 PM
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So I haven't used this AIO but when I was using a Kraken x62 if I plugged into the AIO or PUMP header on my now dead Asus board I would get no speed signal, you could feel it was pumping by holding the line but no signal output. I gave up and just connected to the CPU fan header and it gave me the signal, not sure if this would be the same situation in your case but its worth trying.

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post #3 of 27 (permalink) Old 06-07-2020, 02:23 AM
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Do you have LFII Revision 2? You can check it on the box where the product code/barcode are. The first revision's PWM signal reported the pump's RPM instead of radiator fans, Rev 2 should report fan RPMs out of the box.
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post #4 of 27 (permalink) Old 06-07-2020, 04:08 AM - Thread Starter
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Quote: Originally Posted by sleepwithechoes View Post
Do you have LFII Revision 2? You can check it on the box where the product code/barcode are. The first revision's PWM signal reported the pump's RPM instead of radiator fans, Rev 2 should report fan RPMs out of the box.

Yes it’s Rev 2. I recognized it when watching Gamer’s Nexus disassemble video. Mine is like the second unit they got from Arctic. And now I confirmed it by looking in the box.

So does this mean that the pump and vrm fan are always running at 100% and the only thing that’s being controlled by pwm are the fans?

How can the pump react to a pwm signal? I can always attach a fan to the pump signal chain, but now I’m afraid I will only have control of the fan alone and not the pump, unless the pump just executes whatever the pwm sends to the fans


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post #5 of 27 (permalink) Old 06-07-2020, 04:55 AM
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I have the Arctic Freezer II 360mm version (awesome) and if I use HarwardInfo I can see the pump speed or I think it is the pump speed. I have connected it to my CPU OPT header on my Z490 Aorus Ultra motherboard and it is showing a speed as averaging 2900RPM...I do not think this can be the small fan attached to the pump as it is not making any noise and I have heard it get loud when under load testing...though I could be wrong!

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post #6 of 27 (permalink) Old 06-07-2020, 05:00 AM - Thread Starter
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Quote: Originally Posted by vMax65 View Post
I have the Arctic Freezer II 360mm version (awesome) and if I use HarwardInfo I can see the pump speed. I have connected it to my CPU OPT header on my Z490 Aorus Ultra motherboard and it is showing the pump speed as averaging 2900RPM...Hope this helps.

Yours is version 2 as well? You didn’t specify


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post #7 of 27 (permalink) Old 06-07-2020, 05:04 AM
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To be honest, I do not know as I do not have the box though I did by at at launch, probably one of the first buyers so I think it must be a version 1...

Quote: Originally Posted by eliwankenobi View Post
Yours is version 2 as well? You didn’t specify


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post #8 of 27 (permalink) Old 06-07-2020, 05:07 AM
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Also I am not using the fans that were included and am using a different set connected directly to the motherboard...

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post #9 of 27 (permalink) Old 06-07-2020, 05:07 AM - Thread Starter
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Quote: Originally Posted by vMax65 View Post
To be honest, I do not know as I do not have the box though I did by at at launch, probably one of the first buyers so I think it must be a version 1...

Remember looking at the bottom of the pump, if the vrm fan had a small white connector it’s v1. If if was black and soldered, it’s rev2
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post #10 of 27 (permalink) Old 06-07-2020, 05:16 AM
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Okay I just did a Prime95 load test and the VRM fan does ramp up in speed but the CPU OPT RMP stays the same at roughly 2900 to 3000RPM but the confusing thing is that the Pump speed is rated up to 2000 rmp and the VRM fan is rated up to 3000RPM....I am now thoroughly confused!

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