CPU Temperatures

Having had a good amount of success with tuning settings, I am left with a puzzle - sometimes I get smooth flight, other times not - same area, same settings, same aircraft.

When I look at my CPU charts, smooth flight shows a relatively stable CPU. When I get stutter/judder, not unsurpisingly by CPU is a bit choppy as well, and spiking more often to max.

Could the CPU temp be an issue - it does seem [subjectively] higher when things are less stable.

Stable = < 80C
Unstable = > 80C

Has anyone else had issue with CPU temperatures?

i9 11th gen with AI boost enabled in the BIOS (gets to 5.1 Ghz)
Cooling - Corsair H100i ELITE CAPELLIX + thermal paste
64GB RAM
3080ti

Hey @CydianBryce. I am no expert, but I seriously doubt your CPU temps are causing this unless they are spiking higher than the TjMAX temp of around 100*C (not sure of exact peak TjMAX for your CPU). Once a CPU reaches the TjMAX value, cycles are slowed (throttled) to prevent further overheating, and that will be seen in performance. BTW, I use HWiNFO64 to measure my CPU/GPU performance, and throttling is one of the measurements.

No doubt others with far more experience will weigh-in.

Run HWinfo to figure out exactly what is going on with your hardware.

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In the end I found that I could turn the fans up higher - plus I took the lid off for a while. Ran noticably cooler but did not make any difference, so am looking elsewhere.

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Mine fluctuates between 70 - 90C

If 90*C is just an occasional spike, you should be just fine. And remember that the ambient temperatures where your computer is located play a role as well. Cool the room down, the CPU cools down, all things being equal.

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Are you using MSI Afterburner with RivaTuner to monitor your CPU temperature while gaming? Did you build this PC yourself? If you did, when’s the last time you changed the thermal paste? Make sure the cooler is mounted correctly and the pump isn’t failing.

For me, personally, before I choose a cooler, I usually watch Hardware Unboxed when they do test bench for different coolers, etc… Gamers Nexus is also a really good YouTube channel.

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Not Afterburner (but am looking to try that), but CapFrameX.

PC was built by PC Specialist in the UK, less than a year ago. Very pleased with the built quality. Havent changed the thermal paste.

That said, I am now able to get it runing under 70C - tried a couple of things - just need to work out which had the effect.

One was removing a ‘filter’ mat inside the top lid (Corsair mid tower) - that could have been restricting the airflow to the CPU cooler.

The other was that I had AI Turbo Boost enabled.

What you are observing is not CPU temp impacting performance but in fact CPU load impacting temperature.

CPU chugs along and performance is ok = the temps that you usually observe.

CPU suddenly asked to do a lot more (loading scenery assets as you descend/get closer to airports for example) = the activity and temperature spikes that you observe.

CPU is constantly juggling the assets/data from your local drives, assets/data being streamed in over network from servers and of course everything that the sim needs to send back to the servers. It’s doing a lot of work and from time to time probably also waiting for data to arrive from servers before it can continue - after which it needs to catch up.

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As I have already said you really should get a full picture of what is going on with your system. This is what I can see when using MSFS.


I can track everything on a second screen as I am flying or just review from time to time. It shows me current as well as maximum used or reached.

If you want this layout, then I can mail the registry file as a text output. There is a limitation on characters usage in this forum, which prevents me posting it here.

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I have now installed this tool - very useful, very complex - but I can see that there is no thermal throttling going on. So as as @somethingbrite says - higher temps just a result of the sim needing a lot of work to be done.

More practically - removing the filter gauze at the top of the corsair case helped a lot - it was restricting the airflow of the CPU cooler.

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ok pleased you got sorted. A screen dump of the type I dropped are immensely helpful in diagnosing an issue. Systems these days are awash with sensors precisely for this purpose. Not having a fuller picture is frustrating as people like to help, but are hampered by lack of information.

I have to comment: For a year my CPU temps would spike and sometimes run in the 80’s to 90’s and I could tell it was throttling. I had my radiator mounted to the front face of my case and behind a clear kens so you could see the RGB fans. The case (a thermal take) is designed for it. The front cover has an air intake at the bottom. Air should have no problem flowing right? WRONG! I relocated it to the top of the case and now it rarely gets out of the 60’s!! This is with an I9-11900K too! I was very surprised but very happy to figure it out.

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