The 5800x is better than the 9900k, but really not by a significant margin
As for OP’s performance, there’s a lot missing from the specs that actually matter. RAM speed? OP is also at 4K, which is almost certainly a GPU bottleneck that’s not being helped by the 9900K.
True.
He mentioned that he has XMP enabled. I’d imagine it’s at least DDR-3200/CAS18, which should be fine.
Of course that’s just a guess…
Maybe he can DM you a list from sysinfo, and you could review it all.
Hi all will anonymise a sysinfo and put it here
Use HWInfo and post the summary view.
Also, post a snapshot of the FPS counter built-in MSFS. Enable Dev Mode and toggle “Display FPS” in the menu at the top. That will go a long way to see what your frametime is actually doing.
Try to bring down the TLOD and OLOD to 150 and I think you’ll get much better performance, especially if you have FG on.
With 3rd party airliners and airports you have to make some sacrifices to get good performance, especially on the ground.
It’s partially a limitation of your CPU but also a limitation of the “simulation” itself. Simulating the physics, aircraft systems, weather, terrain, and buildings puts a lot of load on the CPU, and hopefully MSFS 2024 will address some of them, but I think there is a physical limit when it comes to simulations that is hard to avoid. Think about how scientists use supercomputers to predict weather phenomena or run astrophysical simulations.
Therefore I personally think that 30fps (or 60 with FG) is a reasonable performance for a flight sim, but that’s just my 2 cents.
Something that comes to mind, does the i9-9900K support Re-BAR? I remember that 10th Gen does, but not sure about 9th Gen. If it does, check your BIOS and make sure that is enabled.
Good call. Unfortunately:
Intel 10th generation CPUs and newer support resizable BAR. Earlier Generation Intel CPU’s do not.
I did a little more searching. It appears Re-BAR support is available on Z390 boards if the manufacturer chose to do it. It’s possible the MSI board, with updated BIOS, could support it. I recommend the OP do a bit more research on his specific Z390 board.
https://www.reddit.com/r/intel/comments/mgxoiy/resizable_bar_support_for_9700k/
I recall when REBAR was first released, if was disabled on MSFS due to worse performance. No idea if this is still the case, but Nvidia does have game-specific profiles that enable-disable REBAR based on performance uplift (or lack of).
Yeah, but it does no good to have a MOBO support it when the CPU is unsupported.
Perhaps OP can upgrade his?
I’ve read that ReBAR helps some and hurts others. From a technical standby it makes sense to enable larger data transfers between the CPU and GPU, which is what ReBAR does.
If I understand correctly, the 9900K will support if the motherboard does.
I’ve seen a lot of conflicting info on whether 9th Gen Intel CPU’s are compatible. But this seems to be a pretty well-researched opinion.
Do you have virtualization enabled in bios? If you do , turn it off along with vt-d. I find with my 9700k it helps significantly with performance.
That’s another good one to try 
Thanks all for your tips and tricks, and the ones that got censored. Will try it this week and get back to you with the results !! 
