I just got 3080 Ti. Windows 11 definitely got performance hit compare to RTX 3080 with Win 10. Win 10 with RTX 3080 got 25700, Win 11 with RTX 3080 Ti got 25500. Both with fresh install of Windows. Windows 11 also got all the updates for Ryzen.

Code:
FINAL FANTASY XIV: Endwalker Benchmark
Tested on:  11/10/2021 16:23:51
Score: 25566
Average Frame Rate: 179.1382
Minimum Frame Rate: 81
Performance: Extremely High
-Easily capable of running the game on the highest settings.
Loading Times by Scene
  Scene #1	1.094 sec
  Scene #2	2.049 sec
  Scene #3	3.059 sec
  Scene #4	1.393 sec
  Scene #5	0.738 sec
 Total Loading Time	8.333 sec

DAT:s20211110162351.dat

Screen Size: 2560x1440
Screen Mode: Full Screen
DirectX Version: 11
Graphics Presets: Maximum
General
-Wet Surface Effects: Enabled
-Occlusion Culling: Disabled
-LOD on Distant Objects: Disabled
-Real-time Reflections: Maximum
-Edge Smoothing (Anti-aliasing): FXAA
-Transparent Lighting Quality: High
-Grass Quality: High
-Parallax Occlusion: High
-Tessellation: High
-Glare: Standard
Shadows
-Self: Display
-Other NPCs: Display
Shadow Quality
-LOD on Shadows: Disabled
-Shadow Resolution: High - 2048p
-Shadow Cascading: Best
-Shadow Softening: Strong
Texture Detail
-Texture Filtering: Anisotropic
-Anisotropic Filtering: x16
Movement Physics
-Self: Full
-Other NPCs: Full
Effects
-Limb Darkening: Enabled
-Radial Blur: Enabled
-Screen Space Ambient Occlusion: HBAO+: Quality
-Glare: Normal
-Water Refraction: Normal
Cinematic Cutscenes
-Depth of Field: Enabled

System
Microsoft Windows 11 Pro (ver.10.0.22000 Build 22000)
AMD Ryzen 9 5900X 12-Core Processor            
32696.121MB
NVIDIA GeForce RTX 3080 Ti(VRAM 12108 MB)