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.
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.