I see, thanks for your help! The 4090 is from palit though while the used 3090/3090ti are from MSI or Gigabyte, which are more expensive in general. For my use case however, the brand should not matter. Does the advice for undervolting still hold for the 4090?

3090 900-1000, 3090ti 1200-1300 4090 new 1750, which is why I considered still a new 4090, because the price gaps between those 3 Options seem odd.

I see and took a look, the 3090 ti is sometimes available for only 100 euros more (used that is). Is that something I could consider aswell?

I am not confident comparing these charts perfectly, it 'looks like' the 4090 is superior to the 3090 (3090 because it has the same VRAM, which is an important factor as I have learned), but by how much? Does the price justify the advantages of the 4090?