" I remember that I could stay below 80° or slightly above with same config and SU5 at certain flights. "

That's a real key. It used to be that it was running cooler for you. But now it isn't. I doubt your fan quit working as well as it used to. Only you know if you were poking about in BIOS recently that could cause the change.

Not much help, but I had exactly the same problem, starting about a week ago. My core temps were shooting up to 95 to 103 C (If and when I was in exterior view and moving the view all around quickly with the mouse). And everything was too hot always, not just when extreme viewing. Even my PSU shut off a couple times.

I went into BIOS and turned down the speed (from 4.0 to 3.7 Ghz) and all went back to normal, about 25 degrees cooler. I remember going into BIOS about a week ago, maybe I had bumped up the speed, I can't remember, I fool around with settings there from time to time.

Or maybe a recent MSFS patch just makes the sim put more of load on the hardware. I'm not sure.

Edited August 22, 20214 yr by Fielder

>>> Not only that Rob, but the heat stays in the case much more than a water cooler. Of course it heats the room up REALLY well, but...

Do not waste money unnecessarily on a water cooler, a properly fitted D-15 is a good enough cooler for your purposes.

1 hour ago, Rob_Ainscough said:

Dump the D15, go with a quality water cooling setup as they will handle sustained high loads better

I would think its the short bursts that water cooling is better at because the water acts as a buffer. Once the water has heated up by a sustained load, that advantage is gone.
With current CPU's IMO neither air nor water has a clear advantage. Both methods should be able to keep the CPU cool and there isn't a clear winner methinks.

Edited August 22, 20214 yr by orchestra_nl
spelling

7 minutes ago, orchestra_nl said:

I would think its the short bursts that water cooling is better at because the water acts as a buffer. Once the water has heated up by a sustained load, that advantage is gone.
With current CPU's IMO neither air nor water has a clear advantage. Both methods should be able to keep the CPU cool and there isn't a clear winner methinks.

An AIO with 360 Radiator will kill every air cooler. 
I run a NZXT Kraken Z73 on my 5900x and the liquid never gets over 50C with fans at 35%. And yeah you can setup the fans to act on liquid temp. Not on CPU temp. 
 

And like it was already said: you blow the hot air out of your case. 

Edited August 22, 20214 yr by swiesma

I had taken a pic of the thermal paste I used, but I cannot find it. How much is less how much is to much?

I have been doing moderate overclocking for many years and am using the same cooler as you on my stock i7-9700K, which never exceeds 68°C in MSFS.   Everything I have seen and done says the thermal paste should be about the size of a grain of rice and should be spread by ONLY the pressure of the cooling device applied to the CPU housing. 

People are finding out that you need to limit your framerates,you will burn up your GPU especially. I set 60 in Nvidia control panel, also 1/2 refresh rate for my 60 Hz monitor. MS2020 is the 1st simulator I have been able to limit frame rates without studdering.

20 minutes ago, TacomaSailor said:

should be about the size of a grain of rice and should be spread by ONLY the pressure of the cooling device applied to the CPU housing. 

I think that would be too little. Check out this vid: https://youtu.be/ofyNgJyhGuc He shows what happens if you put to less of the paste. How you spread the paste does apparently not really matter how the concludes in the video.

I'll try it tomorrow. I sincerly hope that I have forgotten to remove the plastic (which I doubt) that probably would be the easiest solution.

@BIGSKY Framerate is already limited to 30fps. That puts me even in a weirder situation.

Edited August 22, 20214 yr by 737_800

The D15 should be more than good enough if properly mounted. 

Like multiple people in this thread have said, they have the same CPU and same cooler as you, so either it's mounted wrong or you don't have enough airflow in your case. 

Make sure all the screws are evenly tightened. You start in a cross X pattern. 
Make sure both fans are blowing in the same direction
Make sure the plastic cover is not on
Make sure your fan headers are connected to the CPU fan connectors on the motherboard, not a random case fan connector. 

It's better to use too much thermal paste than too little. 

I had the Corsair H100x 240mm AIO cooler, but I wanted to try the D15 again since I've used Noctua coolers in the past. The result was the same temps, less noise, but the AIO had one upside: It takes longer for the whole loop to warm up, so if you're only having temp spikes now and then, the AIO would be better. If you're running prolonged sessions of heavy use, it will heat up to the same temp as the D15 eventually.

Edited August 22, 20214 yr by Republic3D

And both screws should be screwed until they bottom out, they are perfectly adapted in length so that you do not risk to screw too hard, or to loose.

Edited August 22, 20214 yr by Ixoye

Is anybody here using the 3.5 pound (weight) Noctua passive cooler? Costs $110 on Newegg.

 

 

Totally agree with the comments above by Republic3D and would suggest going one stage further by checking the backplate for the Noctua is correctly in position, flush against the back of the motherboard. It only fits correctly in one position, but it can sometimes be fitted incorrectly and still allow the cooler to be mounted, but with unequal pressure applied. 

Some responses have referred to MSFS settings and while these can have an effect on temperatures, the OP in his first post pointed out excessively high temps reached very quickly when running Cinebench which indicate the first place to look is the cooler fitment and correct operation. I have used the D15 for years on a succession of overclocked processors and found it to perform very well in all situations.

Have you tried turning off your OC and instead turning on Enhanced Turbo? I'd be surprised if that yield anything less than 4.8 (in older gens it just pushed all cores to single core boost frequency) and it will keep the voltages in a sensible range. It shouldn't be necessary to mess around with LLC even to achieve 4.8 allcore IMHO.

Try emptying out your community folder 😂

The 4.9 OC of my 10700k which is under a NH-D15S hits a max of 82c in Cinebench but averages around 78c, room ambient 24c.  When running MSFS SU5 I've seen some max core temps of 86c with the same room ambient, though they appear to be very short lived and the average core temp is around 64c.  My guess is that MSFS uses AVX instructions, such as FMA3, which like Cinebench, really bumps temps, especially if you are overclocking.  I don't see these temps as anything going wrong, other than a cooler that is been pushed to it limits.  I go into a bit more detail in this post I made in the hardware section.  In the end, like Rob said, I can get better cooling to care of this, or simply reduce my OC. 

Edited August 23, 20214 yr by TheFamilyMan