u/Round-Obligation5678

Title: Horrible performance in MSFS 2024 after upgrading from 13700K to 9800X3D (VRAM/ SYS RAM maxed out, 10-15 FPS)

Title: Horrible performance in MSFS 2024 after upgrading from 13700K to 9800X3D (VRAM/ SYS RAM maxed out, 10-15 FPS)

Hi everyone,
I recently swapped out some parts in my rig and encountered a massive performance issue with Microsoft Flight Simulator 2024.
Old Specs:
CPU: i7-13700K
GPU: RTX 4080
RAM: 32GB DDR5 6000MHz
With this setup, I was running the game at 4K Ultra settings + Frame Generation. Performance was pretty good, though the frame rate was constantly limited by mainthread.
To see if I could improve the 1% lows and mainthread bottlenecks, I borrowed a Ryzen 7 9800X3D and an X870E motherboard from a friend.
After swapping them in, the performance became an absolute disaster. I'm now getting only 10-15 FPS. Both my system RAM and VRAM are completely maxed out (100% usage). All in-game settings (resolution, graphics presets) remain identical to before.
Has anyone experienced anything similar or knows what might be causing this?
Thanks in advance for the help!

u/Round-Obligation5678 — 7 days ago