Question High CPU temps while gaming and low CPU temps while stress testing

[SwatAssault]

Hello!
I can't figure out why my CPU temps while gaming and while stress testing are so different

CPU temps:
idle - 40-50 C
while gaming - 85-95 C (CPU usage 15%-30%)
AIDA64 CPU stress test - ~60 C (CPU usage 100%)
i also tried running Furmark GPU test and AIDA64 CPU stress test at the same time to see if it's related, but CPU temp is still around 60 C

Setup:
CPU: R9 7900x with lian li galahad aio 360
GPU: RTX 3080TI
MB: Asus TUF Gaming X670E-Plus WiFi
Chassis: Lian Li with a lot of fans

 

[MCH170]

I have never heard of such a thing but maybe your aio fans are controlled by cpu usage? Is that even a thing?

Do they make an expected amount of noise while gaming compared to idle and full load?

 

[triplex1]

Adjust the fan curve from the AIO

 

[derekullo]

Unsure of your bios/aio setup but if its an option make sure that the CPU fan curve is using the CPU temperature sensors.
I remember from years ago some fancy bios gave the option to adjust the CPU fan curve based on the GPU temperature sensors and I thought that's a problem waiting to happen!

 

[SwatAssault]

I have never heard of such a thing but maybe your aio fans are controlled by cpu usage? Is that even a thing?

Do they make an expected amount of noise while gaming compared to idle and full load?

I don't even know if it's possible to make cpu fans be dependent on cpu usage. I mean... maybe with some additional software or some twisted bios manipulations. But I never tried to achieve something like that. What I did is I adjusted the default CPU temp - CPU fans speed curve a little bit and it looks fine. And yes, fans make much more noise while CPU is at 90 C compared to idle

 

[triplex1]

If there is no company software to manage the curve fan, you connect the fans with a Y cable to the CPU and adjust from the BIOS.

 

[SwatAssault]

Unsure of your bios/aio setup but if its an option make sure that the CPU fan curve is using the CPU temperature sensors.
I remember from years ago some fancy bios gave the option to adjust the CPU fan curve based on the GPU temperature sensors and I thought that's a problem waiting to happen!

It looks like my CPU temp - CPU fans speed curve is fine. I tested it and it works as expected. Fans speed depends on CPU temp

 

[CountMike]

It looks like my CPU temp - CPU fans speed curve is fine. I tested it and it works as expected. Fans speed depends on CPU temp

What about AIO pump, is it speed adjustable ? It may have even more impact on CPU temps.
My Arctic Liquid Freezer III 360 keeps my 7900x lower than 85c at full load and 35-40c at idle. Even then radiator fans work at about 1000 out of possible 1800rpm but pump is made so it can run only at full (2700rpm).
What is confusing with your temperatures that its wrong way around, it should be hotter with Aida than while gaming as games rarely or ever push all cores more.
Can you show your cooling arrangement ?
If any fans are connected to CPU_FAN header, by defaults speed is tied to CPU temps. If you connect adjustable pump the it's speed is tied to CPU, anywhere else to MB temps, usually chipset and/or VRM. Most modern MBs also have non adjustable AIO_PUMP and/or PUMP_FAN header usually speed adjustable and with twice as much power.
Best arrangement for CPU cooling with liquid coolers is Radiator in front or side of the case and fans set to pull from or push outside air thru radiator with another same number of fans to evacuate air from the case.

 

[SwatAssault]

What about AIO pump, is it speed adjustable ? It may have even more impact on CPU temps.
My Arctic Liquid Freezer III 360 keeps my 7900x lower than 85c at full load and 35-40c at idle. Even then radiator fans work at about 1000 out of possible 1800rpm but pump is made so it can run only at full (2700rpm).
What is confusing with your temperatures that its wrong way around, it should be hotter with Aida than while gaming as games rarely or ever push all cores more.
Can you show your cooling arrangement ?
If any fans are connected to CPU_FAN header, by defaults speed is tied to CPU temps. If you connect adjustable pump the it's speed is tied to CPU, anywhere else to MB temps, usually chipset and/or VRM. Most modern MBs also have non adjustable AIO_PUMP and/or PUMP_FAN header usually speed adjustable and with twice as much power.
Best arrangement for CPU cooling with liquid coolers is Radiator in front or side of the case and fans set to pull from or push outside air thru radiator with another same number of fans to evacuate air from the case.

Hello! Thank you for your response
My cooling arrangement:

https://www.dropbox.com/scl/fi/yho3...ey=wjirpupun0vbr1h5gg8v7037m&st=qbby4752&dl=0

Looks like my AIO pump is at full all the time (it is shown on the AIO pump curve in BIOS and I can see it is running on 3300 in AIDA)
And my connections are:
pump -> AIO_PUMP
radiator fans -> CPU_FAN

Another thing is I built this PC a year ago. All hardware was brand new (except GPU). I adjusted some preferences such as CPU undervolt, CPU and GPU fans curves etc. I haven't touched anything since then. After that I did some testing. And I remember my CPU temp was about 84-87 C while running demanding games. Now (in a year) I started noticing my fans make more noise so I looked up CPU temp. And it is 90+ (even 95 sometimes. It cleary reaches its limit and starts dropping frequency). Could this be some CPU cooling system degradation? Or should I consider refreshing my cooling paste on the CPU. Or is this even a thing

 

[triplex1]

What thermal paste have you put on?

 

[SwatAssault]

What thermal paste have you put on?

ID-COOLING X25

 

[triplex1]

ID-COOLING X25

Change it put mx or noctua or cryorig