Hi there,
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When I am running MSFS (Background minimised) I get these large spikes in usage which causes my CPU Tctl/Tdie to spike (causing the cooler to ramp up and down).
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Nothing in the windows processes is giving me a clue. Any ideas?
Normal behavior, nothing to worry about.
Mine spikes too, not to 88 °C because I have a 360 mm liquid AIO cooler, but it touches 80 °C sometimes.
Thank you for the reassurance. In that case i want to reduce the reactivity of the case fans (i set level 3, reactivity, on all the chasis fans in the bios). I hope this works as on the main page of the bios I am not seeing a chasis fan active.
Does that sound sensible?
Also this seems to be an MSFS thing, particularly during cruise
Yes, ideally the fan speed should be correlated to the liquid (if you have an AIO) or case temperature because the CPU temp fluctuates too much and the frequency changes of the noise are annoying. You can select the source of the temp for the respective fan speeds in the BIOS.
The fan speed up i am having is case fans, still trying to work out how to fix this.
MY MSI BIOS has a responsiveness setting associated with every smart fan curve.
I have my CPU air-cooler set at the default 0.1 seconds. Point is, I could increase that temp/fan speed lag if the heatsink fans were cycling too fast.
Hi there, UPDATE.
I have changed the case fans manually so they don’t try and keep up with the CPU.
I am getting the same as this (now) closed thread
Extreme CPU usage at cruise altitude - General Discussion & Community Support / Tech Talk - Microsoft Flight Simulator Forums
It’s something in the cruise which is spiking the CPU. I have low power mode on, and limited fps when minimised.
As one descends or on the ground, the issue goes away.
As a test, I have just run COH3 (CPU intensive) for 2 hours and the max Tdie temperatures was 67.1C.
Started noticing the same behaviour after wu15 nordics, although not sure whether thats the issue or if I wasn’t paying attention to it before that. Usually cpu temps are stable at 55-62c and cpu usage around 25-30%. Random spikes up to around 35-40% cpu and 75-80c (at most). I’ve concluded that it must be scenery/objects loading causing this. It starts shortly after takeoff, continues throughout the whole cruise phase and gets less frequent when decending and rarely happens on final. When on ground either taxiing or parked it never happens. It also doesn’t happen over water. I also discovered that having FlyTampa EHAM installed seems to cause the spikes to be worse with usage spiking to almost 60% and the highest temp spike I saw was 87c. It happened even though I was nowhere near the airport and was back to normal once I uninstalled EHAM. I noticed the spikes for the first time after enabling expo and coincidentally flying to EHAM. I dissabled expo but was still seeing the same spikes. Naturally the usage spikes cause a drop in fps but I rarely notice it. It’s only a momentary drop in fps and I think frame generation smoothens it out abit (around 10fps drop for a split second more or less)
7800x3d
32gb gskill ddr5
4090
1tb & 2tb samsung 990pro
Arctic liquid freezer ii 360mm aio
I think you’re on to something.
I don’t think you turn off your expo, remember these chips can run up to 89C before throttling.
I dont think this is an issue with the chips, it’s something to do with how msfs is loading in scenery as you say.
I did a UK to Barbados run and I didn’t see the temperate spike at all… However, flying over Europe, absolutley.
Update, still getting this after Su14, tdie/tctl spiking to 91.6C (cores max 81C) in cruise.
This doesn’t happen on the ground and not in any other games.
Same here. Brandnew rig. 7800x3d with 4070ti. At ground, takeoff cpu temp does not go higher then 65 degrees. Once on cruise I have temp spikes to 92 degrees. Between de spikes it drops to 60 degrees. Very strange behaviour and no clue what’s causing it. There is nothing in the background that is running. It’s msfs that goes up en down in cpu usage causing these temperature spikes. And only during cruise.
This isn’t an issue specific to the 7800X3D, as my 14900K also exhibits this same behavior. From what I can tell, it’s sudden spikes in CPU usage. I can see the CPU package power go from ~120W to over 200W coupled with a temperature spike in just a few seconds before settling down, always when at cruise.
As far as I can tell, this is an MSFS issue.
I had a very frustrating support ticket conversation with MSFS (Scott) who refused to believe that it was the sim and that it was other add ons.
Please can you guys raise a ticket, link this thread and hopefully they’ll be aware of it more for MSFS24.
I was wondering. I changed motherboard, cpu and ram 3 days ago. Changed from am4 to am5. Did not reinstall windows 11 or msfs. Could it be that msfs is confused about the change somehow? U guys coincidentally did not change mb also without reinstalling everything?
I also have this problem (5800x3d), exactly identical to how it was described. It is undoubtedly related to MSFS because it is the only software that causes it. However, since I had already noticed it in November and December, I can testify with certainty that it had disappeared (I almost always fly in Europe and almost always with 737 PMDG, so it is certainly not linked to changes in my use of the SIM) and has reappeared since some day.
I just reinstalled windows and msfs from scratch. Still happening so it must be something related tot msfs. Question is what…
I think it has to do with how MSFS handles bulk of data during the flight. Hopefully the new SU15 beta will solve this.
Nope it did not.
I have installed aio watercooler in the mean time and adapted the front of my case to have a much better airflow. The temp spikes are still there but maximum spikes now reach 82 degrees Celsius. So good cooling and airflow is essential.
I have exactly the same issue as described above. I upgrade my gpu from 2070S to 4070 TI S. and since then when i do a flight in Europe my CPU temp went to 89 degrees during spikes on which is then recovers to 70 degrees ish.
i went and undervolted my 7800X3d and did some test in Cinabench. The max temp in Cinabench with the undervolt was a max of 71 degrees. But still after this test when i fly in Europe the CPU spikes to between 78 and 81 degrees (higher then the most demanding CPU cinabench stress test 
). MSFS is the new benchmark of stress test which should absolute not be true.
When i flew in the US my CPU was stable between 65 and 70 degrees but in Europe it spikes to really high temps. There is absolute something wrong with MSFS in Europe. In other games my CPU stays very cool. I cool it with a 360 mm X73 NZXT which does the job in cooling really well, but not in MSFS.