Same specs as you, but with 64GB of DDR5 6000mhz ram and 10gbps fibre wired connection and windows 11 24H2.
Ultra Preset, TAA, TLOD200/OLOD200. 4K. FPS locked to 90/120 using rivatuner.
Getting awful fps as well. On the otherhand, I average 100 in fs2020 with TAA FG and TLOD/OLOD 200 running at 4K everything maxed on ultra. Locked fps at 120 using rivatuner. All these with Activesky, REX Atmos, Vatsim, PMDG/Ifly and tiktok streaming together. Never had an issue with performance, fps is stable and gpu/cpu temps are nice and low.
I am getting roughly 98% GPU utilisation with an avg temp of 81-83degrees on FS2024. CPU around 40% utilisation at 62degrees. All these even when I am at the menu and not flying. Fans are spinning madly and is so noisy. I can feel my PC heating up my room.
No addons, vanilla standard gamepass edition fs2024.
In career mode it does okay though, quite smooth, not as smooth as fs2020, in free flight it’s even worst. My fps tanks to 30 and I get stutters every now and then.