Ray, just to clarify: When you mention CPU 1, are you referring to core 0 or 1?  I am asking because the first core is usually labeled as core 0 (so I am not sure if that is CPU1).

@Afterburner, Hi. I’m using RTSS to display this data and I suspect they have a base of 1 rather than 0 with Windows.

I’ll need to check tomorrow but if I’m correct CPU1 in RTSS refers to Core 0.

I’ve had a reply from LM on their forum which is nice. I’m going to change a setting in the cfg tomorrow and report my findings. It relates to how Ai are handled and is a binary option. Maybe that will make a big difference.

2 minutes ago, Ray Proudfoot said:

@Afterburner, Hi. I’m using RTSS to display this data and I suspect they have a base of 1 rather than 0 with Windows.

I’ll need to check tomorrow but if I’m correct CPU1 in RTSS refers to Core 0.

I’ve had a reply from LM on their forum which is nice. I’m going to change a setting in the cfg tomorrow and report my findings. It relates to how Ai are handled and is a binary option. Maybe that will make a big difference.

Ray, a big thank you for all energy you are putting into this 👍

On 6/13/2021 at 9:43 AM, btacon said:

FWIW, since the upgrade I’ve seen my CPU temps of my i9700k not o/c starting to hit T Junction temps will all cores peaking out at 100c while averaging about 90c. Definitely not like before. Tonight I am pulling and reseating my fan / cooling but I must also say when flying MSFS 2020 my average core temps stay at about 70c and NEVER hit 100C. 

Is anyone else seeing significantly higher CPU temps?

TIA,

-btacon

Here is an update to what I am seeing on my system. As mentioned above, once I installed P3dv5.2 I noticed an immediate increase in my CPU usage,  This seemed consistent over all 8 cores.  Most noticeable was a constant increase in package/cores temperature with all 8 hitting 100c within five minutes. This is not to imply that my processor was running constantly at 100c but it was running hot enough that the processor was bouncing up to 100c and was being throttled pretty much all the time. Ths WAS NOT my previous experience with 5.1 HF2.
 

My first step was to pull and repaste/ reseat my cooling fan. After that I saw no real difference with avg temps hovering around 90c and still hitting 100c on all cores. My cooling fan was never an issue before 5.2 and I was able to run MSFS2020 using it with average temps of 70c (or slightly below)  

Next I purchased and installed a Cooler Master Hyper 212 Heatsink / Fan which is commonly used for overclocking.  It’s quite large and robust and with it installed, P3d v5.2 is now running at average temps of 55-60 centigrade, a significant and welcome improvement.  

Was it my old heatsink or P3d v5.2 that was the culprit here?  Not sure but I suspect the software in light of this thread and the fact I had no heat issues prior to installing 5.2

YMMV,

-btacon

 

 

IDK, but I wonder why my GPU 1080 Ti about 50-60% loaded in heavy airports with overcast and heavy PMDG 777, but CPU 8700K (4.8Ghz), always loaded on 90% 

4 minutes ago, btacon said:

Here is an update to what I am seeing on my system. As mentioned above, once I installed P3dv5.2 I noticed an immediate increase in my CPU usage,  This seemed consistent over all 8 cores.  Most noticeable was a constant increase in package/cores temperature with all 8 hitting 100c within five minutes. This is not to imply that my processor was running constantly at 100c but it was running hot enough that the processor was bouncing up to 100c and was being throttled pretty much all the time. Ths WAS NOT my previous experience with 5.1 HF2.
 

My first step was to pull and repaste/ reseat my cooling fan. After that I saw no real difference with avg temps hovering around 90c and still hitting 100c on all cores. My cooling fan was never an issue before 5.2 and I was able to run MSFS2020 using it with average temps of 70c (or slightly below)  

Next I purchased and installed a Cooler Master Hyper 212 Heatsink / Fan which is commonly used for overclocking.  It’s quite large and robust and with it installed, P3d v5.2 is now running at average temps of 55-60 centigrade, a significant and welcome improvement.  

Was it my old heatsink or P3d v5.2 that was the culprit here?  Not sure but I suspect the software in light of this thread and the fact I had no heat issues prior to installing 5.2

YMMV,

-btacon

 

 

That are very high temperatures which probably results in CPU throttling?... I have 8 Cores too and my temperatures did not noticeable change between 5.1 and 5.2. In demanding situations it may go up until 65-70°C but not much more. I have AVX instructions (-3) activated in BIOS, maybe that is a point too, as it has already been mentioned here. To summarize, I don't see a significant hit on Core0 after the update.

13 minutes ago, Druce said:

IDK, but I wonder why my GPU 1080 Ti about 50-60% loaded in heavy airports with overcast and heavy PMDG 777, but CPU 8700K (4.8Ghz), always loaded on 90% 

same here I have a 1080ti and a 8700k  im getting exactly the same results. 

Edited June 14, 20214 yr by fluffyflops

I may go back to v5.1 if this CPU issue doesn't get resolved. The difference is not noticeable enough for me to chance damaging my processor. I know there are varying opinions as to whether the CPU usage display is accurate, but I would prefer not to chance it.

Cheers, Pete

FYI, if you don’t have any monitoring installed, here is the best. Free and open source, it supports pretty much everything out there. 

-btacon

https://openhardwaremonitor.org

 

This is the reply I received from LM earlier. For those experiencing the problem try this and see if it makes any difference.

Thank you for the reports. To help us better identify the cause of the issue, could you try disabling Adaptive SimGroups in your Prepar3D.cfg and post your findings regarding CPU usage?

[SIM] AdaptiveSimGroupEnable=False

When enabled, AI objects within distance and speed thresholds will simulate at the same rate as the user object. This is done to reduce jitter when in formation flight with AI objects or multiplayer players. Disabling this setting will leave AI objects at their predefined simulation rates.

A before and after comparison of your core CPU processors should indicate if it makes any difference.

25 minutes ago, btacon said:

FYI, if you don’t have any monitoring installed, here is the best. Free and open source, it supports pretty much everything out there. 

-btacon

https://openhardwaremonitor.org

 

Thanks for posting this. I just installed it and then departed KORD during the daytime in PMDG NGXu, and 6 of the 8 cores were at 100% usage, with only Cores 2 and 3 being in the 60% range. The Average CPU usage was 90%. I haven't yet tried Ray's "[SIM] AdaptiveSimGroupEnable=False" suggestion yet so I will give that a shot as well. 

Cheers, Pete

Has anyone noticed if they are getting lower CPU usage when not limiting FPS? I know the Core 0 at 100% is common when locking FPS (how you do it, doesn't seem to matter), but oddly when I remove all FPS limiting, the core usage on Core 0 goes down to around 70% and the other cores don't spike as much - even though the sim is pushing say 80 FPS rather than a locked 30 FPS. It would be quite odd to have lower usage when pushing more FPS!

Doesn't solve things for me though because however 5.2 is working the CPU, it is causing throttling on my CPU - the same settings on 5.1 and no such temperature issues or throttling so in my experience there is either a bug with the CPU usage or 5.2 is working the cores much harder and it shows in the temperatures.

Edited June 14, 20214 yr by krich
Typo

35 minutes ago, krich said:

Has anyone noticed if they are getting lower CPU usage when not limiting FPS? I know the Core 0 at 100% is common when locking FPS (how you do it, doesn't seem to matter), but oddly when I remove all FPS limiting, the core usage on Core 0 goes down to around 70% and the other cores don't spike as much - even though the sim is pushing say 80 FPS rather than a locked 30 FPS. It would be quite odd to have lower usage when pushing more FPS!

Doesn't solve things for me though because however 5.2 is working the CPU, it is causing throttling on my CPU - the same settings on 5.1 and no such temperature issues or throttling so in my experience there is either a bug with the CPU usage or 5.2 is working the cores much harder and it shows in the temperatures.

I always have mine set to unlimited frames per second.

Cheers, Pete

2 hours ago, Ray Proudfoot said:

This is the reply I received from LM earlier. For those experiencing the problem try this and see if it makes any difference.

Thank you for the reports. To help us better identify the cause of the issue, could you try disabling Adaptive SimGroups in your Prepar3D.cfg and post your findings regarding CPU usage?

[SIM] AdaptiveSimGroupEnable=False

When enabled, AI objects within distance and speed thresholds will simulate at the same rate as the user object. This is done to reduce jitter when in formation flight with AI objects or multiplayer players. Disabling this setting will leave AI objects at their predefined simulation rates.

A before and after comparison of your core CPU processors should indicate if it makes any difference.

I tried the modification suggested by lm, but nothing at all ... this is my sad situation ... 100% fixed core and unnecessarily high temperatures. Among other things, I have been crashing to desktop continuously with the ActiveSkyUtils.exe module for two days, who knows if it is not related to this "gutted" use of core 0.

I know this thread is about the 5.1 to 5.2 update, and  I'm not sure if it is relevant, but we had another discussion about 100% Core 0 usage two years ago when 4.5 was the current version.

It appears that this 100% usage problem is known since quite some time. It has been said that running the sim with internal unlimited fps may cause it. But a clear conclusion why some observe 100% usage and others do not is still missing.