Thought it might be interesting to see if anyone had managed to eek out any more performance from this CPU (through either overclocking or Ryzen Master) over and above stock.
As I’m forever constrained by ‘Main Thread’ (who isn’t?!) if there’s anything else left in the tank I’d be interested to know if anyone has found it.
Thanks 
Go to your BIOS and disable Hardware Virtualization Technology and AMD-V or something like that. I did mine on my i9-9900K, and I stopped getting Limited by Main Thread issue, and it became smooth again. A quick search would lead you to this topic:
It’s already disabled both in the BIOS and in Windows itself so no gain there.
Thanks for the suggestion though. Where next? 
One word.
HAGS.
The purpose of Hardware Accelerated Graphics Scheduling is to off load the high priority CPU bound thread from the Windows Scheduler to a dedicated scheduling thread on the GPU.
If you are CPU constrained then you need to shift load, Make the GPU do more work and release the CPU.
I am not sure if the 3900 is Pascal or Turing (Nvidia families) compatible. The only way to tell if your GPU is capable is go to the Windows graphics settings and see if the HAGS option is available. If not then you will have to find some way, through MSFS settings to reduce the load on the CPU.
It is available and I used to have it on. The general consensus was to turn it off so I did 
It’s hard to say I noticed much, if any, difference to be honest so I left it off.
I’ll try turning it back on again and see what happens as I’ve made some changes since I last used it.
FWIW turning the HAGS back on cost me 5 fps, approximately 10%.
No idea why but it will stay off for now 
But what did it do for CPU usage? If you freed some room on the CPU then dropping the LOD slider a touch should take a bit of load off the GPU and get you the fps back. Ideally you should be shooting for under 70% on the CPU with 90-95% on the GPU. That would be the sweet spot.
Nothing sadly. The CPU is still being hammered on the main thread.
Being a 12 Core CPU I never see anything like that utilisation as most software just can’t use it all. Far too often one or two cores are flat out and the rest is sat there doing nothing.
It’s frustrating but is what it is. This thread was hopefully going to give some tips on how to get more out of the cores being hammered, if possible. OC’ing Ryzen’s is a tricky business!
Was there a reason why you got a 12 Core CPU? Are you doing 3D rendering, CAD, and creative multimedia projects with it?
Games are generally not designed for multi-core parallel processing, they always perform well on higher clockspeed and single-core performance over multi-core performance.
A couple of reasons. At the time the overwhelming consensus was that it was the best all round CPU on the market, and was hot on the heels of the Intel equivalents for gaming.
Additionally, I do do some high resolution video editing and rendering, as well as recording. It’s very good for that.
I’m currently trying my very best to not buy a 5900x until the Summer update for FS2020 comes out and then see how the 3900x fares under DX12. My experience in other games is that anyone with a multi-core CPU will see a decent improvement. If I do decide to go for the 5900x it’s a straightforward swop as my system is otherwise compatible.
Until then, if there is any performance in the 3900x’s tank it would be nice to access it if possible. I think going for a new GPU at the moment is a waste of time, as the game is so CPU bound the extra oomph is wasted.
My best guess … Assuming you’re already set to AMD’s high performance plan either you’re short of [fast] RAM or you already have a huge graphics card that is demanding more than your cpu can dish out.
Also play around lowering game settings, not all are gpu centric.
Also a six core 5600X is not far behind the 5900X in single core performance but is less than half the price, I would want to see in game benchmarks before making the decision.
It’s pretty balanced to be honest. 32GB of DDR4 3200mhz RAM and a 2080ti with an NvMe2 SSD.
I tried to undervolt and overclock my 3900x today with CTR 2.0, compared to ryzen master the cinebench test shows 6973 comped to 6662 earlier
Thanks very much. I’d not used CTR before and ironically, pretty much as I saw your post a mate suggested it.
I bit the bullet at the weekend and upgraded to a 5900x as they were a) in stock at Overclockers in the UK and b) were discounted for the day to £470.
I’ve then run the latest CTR version (that thankfully requires virtually no bios changes) and got a pretty significant boost on the stock performance.