I recently paid €80 for a 1TB Samsung 990 M.2and €160 for 4TB Crucial P3 M.2 with half the speed. I feel like the prices are great. And I can easily spot the difference in my every day use compared to my 10 year old 5400rpm hdd that costed about the same back than.
Got my gf a 2TB version. She also lost most of her files after 1 month of usage. She uses MacOS. But it's probably to some degree of personal failure. So not sure if this is relevant.
While the 7800x3d should do a great job for the next 7 or so years, I believe the 5800x3d should be fine for 5 years in terms of not bottlenecking you.
As you are from germany, you could use geizhals.at for the cheapest prices. If you are not in abruah to buy it, you should use the price notification aswell.
Many have mentioned the 7800x3d. The 5800x3d is more like your budget and perfect for gaming. Currently almost the same performance.
Due to heat, materials can bend. If a material was under alot of tension already before, it can sometimes pop (click sound) to release it. Just like poping a pimple.
Depends on what exactly it is and how exactly it is poping it might be a problem but usually you should be fine.
You don't eat animals?