AMD’s Ryzen 7 5800X3D 10th Anniversary Edition relaunched at $349 as a compelling AM4 gaming upgrade with improved 3D V-Cache packaging and better thermals, but sold out across major retailers within minutes. Scalpers quickly pushed resale prices to $600 or more, though AMD says continued production should ease shortages and return availability closer to MSRP.
I can’t justify the expense going from a 3950x
Depends if you need those cores more than the gaming performance, which is very personal. I ended up going from a 3900x to a 5800X3D a few years ago cause i ended up not using the extra cores. I thought my 3000 series was still going pretty strong, but i was surprised at how much the 5800X3D improved things. Especially in CPU-heavy games it was huge.