I wondered that as well. He said “Exact” so I assumed he was.
Get into settings in MSFS and set dev mode to on. At the top menu, maybe in debug section, tick the ‘display fps’. Now you get a fps counter with some information at the top right corner, and it will always tell you what is limited by now. In your case, your system most likely limited by GPU.
Upgrade 7800X3D from 5800X3D will give you additional cpu power for sure. You can notice that when you fly into dense sceneries, huge airport with lots of autogens. Your fps may jump from 30 to 40, but may still limited by cpu.
If you see no difference in any scenario, which is a bit unrealistic imo, then you may always have gpu bottleneck. But as long as I am using a 6900XT, which is a bit slower than your 4070Ti, and I am also using 4K with ultra settings, I am 100% sure there will always be cpu bottlenecked scenario like inibuilds EGLL.
To make it simple to understand is, you will always be CPU bottlenecked or GPU bottlenecked, either one but not at the same time. You will gain more fps out of 7800X3D when CPU bottlenecked, and no gain when GPU bottlenecked.
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Reinstalled Nvidia drivers and seems to made things much better. Using dx12beta with fenix A320. Solid 30fps (capped at half monitor refresh rate) No stutters anymore and vram doesn’t fill up complete.
Still on 4k and two additional screens.
Told set at 140
Object lod at 100
Don’t know what the problem was.
All I can say is, “That’s MSFS for you”, sometimes there is no reason, it just is. 
I’ve kinda given up on rooting out solutions to issues for a while as it just takes over valuable simming time. As long as my PC doesn’t sound like a Dash 8 on TOGA and I’m not in Charlie Chaplin film, I just accept it and hope MSFS 2024 goes some way to sorting these strange performance issues that come and go. We can only pray 
.
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Glad to hear it, Venom.
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