Why is CPU so hot with MSFS ?

[Noel 4,571]

6 hours ago, Ixoye said:

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

Water cooler is a whole bunch of overkill for typical overclocks.   45C-55C peak in mid summer ambient temp of 77F in my play room, and that is at 5.0Ghz all cores 9900Kw/ a D-15.  Even HT enabled only gets to a couple degree warmer in MSFS. 

[Noel 4,571]

32 minutes ago, TheFamilyMan said:

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 bet better cooling to care of this, or simply reduce my OC. 

What the heck is wrong w/ your 10700K?  Bad paste?  No soldered IHS?  I've run stress tests w/ AVX instructions and never went over 62C or so at 5Ghz all cores with a 9900K.  Never been over 56 or maybe 57C in MSFS and that in a warm room.  But my 9900K only needs 1.21v to get there I just remembered.

Edited August 23, 2021 by Noel

[TheFamilyMan 281]

1 hour ago, Noel said:

What the heck is wrong w/ your 10700K?

Bad lottery pull with Asus 51 SP, it happens ☹️.  1.22v AVX load at 4.9Ghz, 1.34v at 5.0Ghz.  At least the performance difference here barely matters (but only if I could reasonable hit 5.2 w/HT...now we're talking). My old 4770k was nearly golden...oh, those were the days.

Edited August 23, 2021 by TheFamilyMan

[Noel 4,571]

2 hours ago, TheFamilyMan said:

Bad lottery pull with Asus 51 SP, it happens ☹️.  1.22v AVX load at 4.9Ghz, 1.34v at 5.0Ghz.  At least the performance difference here barely matters (but only if I could reasonable hit 5.2 w/HT...now we're talking)

Even so 5.2gHz is only 6% more processing power over 4.9gHz, which is hardly perceptable by the end user.  I don't understand why it runs so hot considering the work it's performing and does in fact have a soldered IHS.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

[scotchegg 4,255]

It’s in no way a fix for temps created by software issues, but disabling hyperthreading brought down my temps in msfs. With it on I got within 10% of throttling on one core.

[TomCYYZ 219]

My perspective, Corsair ONE Pro (3yrs. Old), i78700K here, in-game, 50-50 High\Ultra settings, locked at 60, vsync on, HT,  Corsair Bespoke 120mm water-cooling radiator (CPU \ GPU). I am running 50-60 C.