Hello everyone,
maybe someone is having a solution or the same problem. I do have a I9-10900K CPU wihich was overclocked to 5300mhz. When starting FS2020 most of the times I saw 4900mhz which remains stable. Sometimes the frequency is 5000mhz and remains also stable. I didnt got 5300mhz so far. Does anyone know what the trigger for the system is to start with different frequencies?
Sounds like you don’t actually have all cores overclocked to 5.3GHz and that your CPU is running at stock frequencies that are lower for sustained multicore use.
eg per info found here https://www.anandtech.com/show/15785/the-intel-comet-lake-review-skylake-we-go-again shows that the I9 10900K in stock configuration will run at 4.9GHz sustained multicore (which FS2020 will operate at 4.9GHz with sufficient thermal headroom, which it appears is what you are achieving.
Check your BIOS that you are actually overclocking.
MSFS seems to be an AVX workload. Strange enough. What is your AVX offstet set to in the bios?
Use a manual oc. All core @ 5ghz should be easy with a decent cooler. Use static voltage at first and start with 1.25 volts. When it’s stable change it to dynamic vcore and a negative offset till vcore under load is the same as the static vcore. For me -0.1 vcore is stable with temps between 75-80 under full load.
Don’t think you can easily get higher though. Above 5ghz the 10900k needs alot more volts. So it’s harder to get it stable with good temps. 5.2 should be doable but my temps rise above 90 and vcore goes too high for my liking. You can always try ofcourse but expect lot’s of blue screens and high temperatures during the process.
Ps. The 5.3 ghz is probably the max boost clock the cpu can achieve on 2 cores max out of the box (i believe) but once temps are above 70 the cpu will go to 4.9 on all cores. 5.3 is barely achievable on most of the cpu’s. Even with sufficient cooling. It’s more a marketing thing then a real spec because in the real world these clocks are very uncommon. That’s why most people will use a 5ghz all core clock. And to be honest, you’re not going to notice the difference between 5 or 5.2 in msfs.
I don’t know which MB you have but yes, you seems to not really OC your CPU to all core.
To give you an idea, below my set of settings to reach 4.9 or 5.0GHz on all core (so at the same time) and fully stable, with my i7 10700K, and my MSI MPG Z490 Gaming Edge Wifi. This is the only changes I have to do from default bios settings, the first one is the one you are looking for (CPU ratio Apply Mode). Depending MB names will differ.
Warning, it will not work for you as-is obviously, each processor are different.
---------- Common for OC:
CPU ratio Apply Mode : All Core
CPU Ratio Offset when running AVX: 0
CPU SA Voltage: 1.200
CPU IO Voltage: 1.200
DRAM Voltage: 1.350
Intel C-State: Disabled
CPU LoadLine Calibration Control: 3 ou AUTO = Flat
---------- OC 4,9GHz Stable (CURRENT, max temp 71):
CPU Ratio: 49
Ring Ratio: 46
CPU Core Voltage 1.200 (VCore)
--------- OC 5,0 GHz Stable (TESTED, max temp 81):
CPU Ratio: 50
Ring Ratio: 47
CPU Core Voltage 1.260 (VCore)
I’m not an expert, just I have some experience, and those settings work fine for me, tested during an hour with different stress tests. I know I can do better (E.g. dram voltage lower). I optimized my air flow recently so temps are lower now, I didn’t redo the one hour stress test.
I intentionally keep the 4.9Ghz OC for now and not use the 5.0 one. I don’t need that much power and I prefer to keep it cool.
Edit : I have an old Noctua double fan NH-U12P SE2 from 2012, it went from my i7 3770K with success, I just changed both fan to new ones recently as they were a little tired 
CPU Cstates. You can switch them off in BIOS and have your CPU run @ full freq. Although 100mhz difference in clocking is caused by CPU when is not required to run @ full frequency.
