Although I don’t doubt you, the rendering looks as fake as it gets.

But is there a way to fankenstein more RAM on a existing 3090? Are there shops I could send mine to?

The same way as Zaphod Beeblebrox survived the Total Perspective Vortex:

I’m the center of my universe ;-)

I had to switch to NVidia because I needed CUDA and damn… AMDs Linux support was soo much better.

If you can, support AMD. Nvidia is just the shittiest company ever.