CPU temps jumping up frequently - defective AIO?

[RTX 3071]

Sometimes my CPU temps jump up to 70's from 40's, doesn't matter if it's on load or idle. I'm using Xigmatek Aurora 240, this isn't a really good AIO but at least I saw people with 9900K and using this AIO they get temps like 65°C on CB20 however I get 83-85°C with my 3800x, if they have close TDPs that means they shall have close temps too I guess.

 

I also observed voltages while this jump is happening and it doesn't seem like it's related with voltages.

 

I bought new fans for my case but it didn't affect anything either.

 

AIO also shows 5000 RPM's on BIOS which is weird because it's 1800 RPM, is my AIO cooler defective? Shall I RMA it and ask for repair? Maybe there's air bubbles inside and they create something like this.

 

I also have a Wraith Prism cooler which I never touched, I can of course try with that too but I need to be sure before because it'll take time to install it.

[Alex Atkin UK]

21 minutes ago, RTX 3071 said:

I saw people with 9900K and using this AIO they get temps like 65°C on CB20 however I get 83-85°C with my 3800x, if they have close TDPs that means they shall have close temps too I guess.

Actually no, how AMD and Intel specify their TDP are completely different and neither have any relation to the actual heat output they generate, its quite annoying.

Also with AMD using chiplets, their cores are in a completely different place to Intel so an AIO designed to cool primarily the middle of the heat spreader can perform really poorly on AMD where the middle is mostly empty with the cores offset to the side.

 

[RTX 3071]

17 minutes ago, Alex Atkin UK said:

Actually no, how AMD and Intel specify their TDP are completely different and neither have any relation to the actual heat output they generate, its quite annoying.

Also with AMD using chiplets, their cores are in a completely different place to Intel so an AIO designed to cool primarily the middle of the heat spreader can perform really poorly on AMD where the middle is mostly empty with the cores offset to the side.

 

That can explain high temps but what about temp jumps?

[SavageNeo]

1 hour ago, RTX 3071 said:

AIO they get temps like 65°C on CB20 however

no way. 9900k uses like doupel the power of 3800x.  65C with 9900k and cinebecnh requires much better cooling. did you see this on reddit perhaps?

[Alex Atkin UK]

40 minutes ago, RTX 3071 said:

That can explain high temps but what about temp jumps?

I was thinking it may need to saturate the heat spreader before the AIO is starting to have an impact?

Have you checked its plugged into the right connectors so the pump is getting enough power?  Its certainly curious you say its showing a higher RPM than it should do.  Have you tried moving the case around to try and manipulate any air pockets out of the pump into the radiator?  Is the radiator high enough up in the case so air isn't gathering in the pump?

 

1 minute ago, SavageNeo said:

no way. 9900k uses like doupel the power of 3800x.  65C with 9900k and cinebecnh requires much better cooling. did you see this on reddit perhaps?

Good point.  I have a SMALLER heatsink on my 5950X than my 9900K and temps are better controlled, with PBO enabled.  The 9900k would thermal throttle on an NH-D15s whereas the 5950X keeps slightly under on a Deepcool AS500.  Although its not really scientific as it depends what sensors you are measuring and if they can be trusted.

If I look at peak temps in HWinfo for example its kinda alarming how high they go, but AMDs own software never shows these peaks.

[RTX 3071]

12 minutes ago, SavageNeo said:

no way. 9900k uses like doupel the power of 3800x.  65C with 9900k and cinebecnh requires much better cooling. did you see this on reddit perhaps?

It was on a forum, yeah I couldn't understand it either.

5 minutes ago, Alex Atkin UK said:

I was thinking it may need to saturate the heat spreader before the AIO is starting to have an impact?

Have you checked its plugged into the right connectors so the pump is getting enough power?  Its certainly curious you say its showing a higher RPM than it should do.  Have you tried moving the case around to try and manipulate any air pockets out of the pump into the radiator?  Is the radiator high enough up in the case so air isn't gathering in the pump?

It's on my CPU_FAN pin and pin is on DC mode, smart fan mode off and motherboard is B550 Gaming Edge Wi-Fi

 

I haven't tried that yet I'll try it now.

Yes radiator is high enough let me show.

Photo reflected a lot but I hope it's visible.

 

I hope that I didn't plug my pump other way around.

[RTX 3071]

On 8/4/2021 at 12:22 PM, Alex Atkin UK said:

I was thinking it may need to saturate the heat spreader before the AIO is starting to have an impact?

Have you checked its plugged into the right connectors so the pump is getting enough power?  Its certainly curious you say its showing a higher RPM than it should do.  Have you tried moving the case around to try and manipulate any air pockets out of the pump into the radiator?  Is the radiator high enough up in the case so air isn't gathering in the pump?

 

Good point.  I have a SMALLER heatsink on my 5950X than my 9900K and temps are better controlled, with PBO enabled.  The 9900k would thermal throttle on an NH-D15s whereas the 5950X keeps slightly under on a Deepcool AS500.  Although its not really scientific as it depends what sensors you are measuring and if they can be trusted.

If I look at peak temps in HWinfo for example its kinda alarming how high they go, but AMDs own software never shows these peaks.

It's plugged in correctly. I tried that but unfortunately, I still get the temperature jumps. However apparently, these jumps aren't for nothing, CPU's power draw also increases that moment. It's interesting, is it a bad power management on AMD's side? Even a new Chrome tab is enough to draw 30 additional watts.

[Alex Atkin UK]

3 hours ago, RTX 3071 said:

It's plugged in correctly. I tried that but unfortunately, I still get the temperature jumps. However apparently, these jumps aren't for nothing, CPU's power draw also increases that moment. It's interesting, is it a bad power management on AMD's side? Even a new Chrome tab is enough to draw 30 additional watts.

Any sudden CPU usage SHOULD cause at least one core to boost with a related power and temperature increase.  However I wouldn't expect any properly installed/functioning cooler to jump in temperature that much, that fast, as the copper cold plate and the water inside should be absorbing that heat.

 

How long does it take for temps to climb high under load?  With an AIO is should generally take minutes rather than seconds.

[RTX 3071]

14 hours ago, Alex Atkin UK said:

Any sudden CPU usage SHOULD cause at least one core to boost with a related power and temperature increase.  However I wouldn't expect any properly installed/functioning cooler to jump in temperature that much, that fast, as the copper cold plate and the water inside should be absorbing that heat.

 

How long does it take for temps to climb high under load?  With an AIO is should generally take minutes rather than seconds.

It climbs fast but stabilizes and never ever increases even 0.1°C on CB R23 10 minutes run. 

[Alex Atkin UK]

On 8/6/2021 at 7:17 AM, RTX 3071 said:

It climbs fast but stabilizes and never ever increases even 0.1°C on CB R23 10 minutes run. 

Which is to be expected as it will be thermal throttling at that point.

[RTX 3071]

6 minutes ago, Alex Atkin UK said:

Which is to be expected as it will be thermal throttling at that point.

There's no throttling, it stabilizes around 83-85 degrees. So what should I do now, shall I try my CPU with Wraith Prism cooler and check if it also jumps like that with it? 

[Alex Atkin UK]

13 minutes ago, RTX 3071 said:

There's no throttling, it stabilizes around 83-85 degrees. So what should I do now, shall I try my CPU with Wraith Prism cooler and check if it also jumps like that with it? 

If its not throttling I'd say there is no problem.  You COULD try the Wraith Prism for peace of mind just to confirm this is normal for your setup.