Triple fan AIO speed/config question.

[exroofer]

Hi folks. I have a rather specific question that I hope someone with similar hardware can answer.
As per sig, I have a Thermaltake 360mm AIO.
Currently I have the rad top mounted in the case, with all three fans running in to a three way splitter that came with the AIO. This is then plugged in to the CPU FAN header on the mobo.
Both BIOS and software report my fan speed max as 715 rpm. Which can't be right.
However just by feel at the top of the case over the rad, the airflow feels pretty anemic.
So my question is..
Is the reported rpm being divided by 3? Making the actual max speed 2100 ish?
Or, do I have these hooked up incorrectly, and they are really only spinning at 1/3 of rated, because I utterly failed at doing it right? ( Always a possibility!)
I suspect they aren't spinning at the right speed, I should be able to have them at 1200-1500 without being excessively noisy, and get a significant amount more cooling.
Temps are in acceptable ranges even with the 4.0 OC, but I think they should be a fair bit better, and having a reported rpm of 600 at 80% ish just can't be right one way or another.
So if anyone has a similar set up, and can offer a bit of guidance, thanks in advance.

 

[Paperdoc]

Why can't it be right? That is a very large radiator capable of removing lots of heat. If your system is not doing really heavy work the CPU will not generate enough heat to demand higher fan speeds.

A proper Splitter (I have to assume the one you got is designed right) will send back to the mobo the speed pulse signal from only ONE of its fans, because the mobo header's counting circuits cannot handle overlapping signals from more than one. Since the three fans are identical, the speed of the other two will be VERY similar to the one you can "see". And yes, that is the speed of ONE fan. The mobo does not know how many fans are attached , nor does it know the speeds of any CPU rad cooler fan except the ONE it gets a signal from.

The website for that AIO says the fans normally will operate in the 1000 to 2000 rpm range. The can run faster than the do now, but it appears your system does not require that.

The automatic fan speed control system for the CPU_FAN header is working to ensure that the TEMPERATURE inside the CPU chip itself is on target for that particular chip design. It is NOT aiming for a fan speed. You might look up the temperature normally found for the CPU chip you have, at idle, moderate load, and heavy load. Then look in your BIOS Setup screens of use a utility that came with the mobo on a CD to observe the actual CPU temperatures you are getting. If they are in the middle of its normal tange, then the fan control system is doing exactly what it needs to do.Then you have two options. You could stop worrying. Or, you could go into BIOS Setup and create a custom fan performance curve to force it to run those rad fans higher and make the CPU run cooler than "normal".

 

[exroofer]

Thanks for that answer Paperdoc.
Looking at the fan splitter, only one of the three legs actually has 4 pins, 3 on the other two.
So it would be reporting correctly.
Tonight I actually swapped two of the stock fans for high flow 4 pin fans I had in my previous case, hooking them up to the CPU FAN header and the CPU OPT header, running the third fan down to a spare mobo fan header.
Since I already had the two fans, I wanted to test it before I did anything silly like ordering 3 fans that I didn't really need, just to have them all match.
Which gave me two 1800 rpm max fans alongside the stock fan, which now reports 1100 ish max speed.
So with a decent fan curve, temps are lower without much noise increase.
Since this is my first adventure into aio's, seeing sub 1000 rpm fan speeds is not something I am used to, and it kinda scared me lol.

The biggest problem for anyone who has an "X" series Ryzen, is the 20 degree offset thing. Which makes it very difficult to set a nice fan curve, since the actual temps (from Ryzen Master) are mid 40's idle, mid 50's gaming, around 70 max letting cpu-z stress test run to saturate the system with heat for 20 minutes or so.
This is with current ambient temps in my room in the 25-28c range. So delta over ambient is pretty good there.
But the mobo sees 20 degrees higher......
And Fanexpert (Asus software) goes vertical on fan speed curve at 75c. So I can't set a curve that represents actual temps, since it won't give me enough range. This is annoying....

It also doesn't help that at idle to normal gaming/light multi tasking loads ( call it 40-50% cpu load),
The reported temps cycle up and down over a 6-10 degree range. Good thing they have a fan smoothing option.
Other people have reported this as well with similar set ups.

At 100% load it stays rock steady. No idea why.

Thanks again for taking the time.

 

[Paperdoc]

Thanks for Best Solution, and for the expanded information.

 

[exroofer]

I wanted to update this thread, because I think it is important for anyone having the 20 degree offset thing making them crazy.

I updated to the latest release BIOS today, NOT the beta bios I used on original system build.
Which is the 1403 bios for the Crosshair 6.
Pleased to report my bios, AISuite, and Ryzen Master all agree with each other now.
40 ish C idle temps, low 50s gaming, low-mid 60s under stress test.

And of course, this means I can actually get a decent fan curve, because the available fan speed ranges agree with the reported temps.
Thanks again for a little guidance, and hopefully anyone who has been messing with SenseMI offsets and other such sub optimal fixes will see this and be happy they don't have to do those things anymore.

I could have done this a little earlier than today, but I had been waiting to see if any full release bios updates came out. Looking pretty stable now. We are in a happy place..
YaY