Sickday

That looks like the Platinum9 theme for XFCE. Setup for it are basically the normal steps to getting Window Decorations installed for XFCE (here), but in general it’s just:

$ git clone https://github.com/grassmunk/Platinum9 ~/.themes/Platinum9

Then set the Window Decoration theme using xfce4 settings

As someone with a burned out 9800x3D and an equally useless X870 motherboard, I would personally say to maybe wait for benchmarks, user reviews, and such for whatever CPU AMD puts out in 2027.