Its my understanding that you can be CPU bound even though CPU usage from whatever tool you use says 30-40% for example.  Thats because it depends more on a one or 2 threads that are maxed out.   On mine, I have CPU7 that is pegged at 100% while the others are 60-70% even though dev mode benchmark info says I am GPU limited.  Could be wrong too, but 9700k is getting quite bound especially when turning on traffic.  When that happens , although FPS doesnt really drop, my frame time sucks and significantly climbs higher. On Gerard's pic posted, thats a very high frame time.  

Anyone want a 4090 check the seller/swap/trade section in the avsim forums. 

2 hours ago, Cpt_Piett said:

I had a look through the images and in the first picture you're GPU-limited so I would not expect the CPU to work that hard. With DLSS on the CPU&GPU seem more balanced. For me the low CPU usage sort of makes sense but I'd like to hear what others think as well. 

I'm most of the time CPU-limited, and like I said with DX12 the CPU usage is very high. 

Okee, to solve a GPU bottleneck :

 

Will test tomorrow. If necessary I might sell my 12900K and buy a 13900K.

Running very detailed scenery with lots of AI ac is surely demanding on a 2x 4K view.

Edited October 24, 20223 yr by GSalden

51 minutes ago, HighTowers said:

Its my understanding that you can be CPU bound even though CPU usage from whatever tool you use says 30-40% for example.  Thats because it depends more on a one or 2 threads that are maxed out.   On mine, I have CPU7 that is pegged at 100% while the others are 60-70% even though dev mode benchmark info says I am GPU limited.  Could be wrong too, but 9700k is getting quite bound especially when turning on traffic.  When that happens , although FPS doesnt really drop, my frame time sucks and significantly climbs higher. On Gerard's pic posted, thats a very high frame time.  

It can quickly get confusing. As we know main thread limited simply refers to the main thread frame time being higher than the GPU frame time. 

This is an explanation of the term main thread on the official forums: 

Quote

DX11 is the Windows interface in which the CPU communicates with the GPU and uses only one core in the process. That’s the main core you are talking about, which is always under heavy load. Until DX12, which can use several cores, all games were basically “single core” (remember the quad-core era of Intel?). All draw calls must go through the main core, which then delegates subsequent actions to other cores. At that time, games generally used 2 cores, with the main core receiving draw calls and delegating further actions to the second core. The third being used by Windows and other applications. Hence why the i5-2500K became a legend, since it had cores enough to run any game and had a good IPC.

What I'm struggling to get my head around is how the main thread behaves under DX12. Since DX12 enables much better multithreading. Does this invalidate the term main thread? Or is there still one thread orchestrating the other threads like in DX11?

In Gerard's image, the fps is 43.4 with a total frame time of 23.04ms running in DX11. Main thread is not that high at 15.8ms whereas the GPU frame time is considerably higher at 21.1ms i.e., GPU-limited. CPU total usage is quite low at 20.4%. Can't see the per-core usage though. My Dutch is quite poor though...

16 minutes ago, GSalden said:

Will test tomorrow. If necessary I might sell my 12900K and buy a 13900K.

Running very detailed scenery with lots of AI ac is surely demanding on a 2x 4K view.

Well this changes things! 😄 No more being GPU-limited, that's for sure. Looking forward to hear about your experience. 

Edited October 24, 20223 yr by Cpt_Piett