I weighed up the pros and cons of swapping a 5800X to a 5800X3D before I migrated to an AM5 platform, and came to the conclusion it wasn't worth it.I'm really debating if going from my 5900X to this one. Actually, for some reason I had to disable some cores on my cpu, so I virtually have a 5800X. Was planning on upgrading to AM5, but didn't do it on time and now it's almost impossible. My GPU is a 9070 XT, I wonder if this 5800X3D would eliminate the stutters I've been having in some games.
I would be taking a closer look at why you can't run your existing 5900X with all cores operating, as this could be an underlying reason you're seeing stuttering in games. If you can't run it stock with everything working, then you may have a faulty CPU and could potentially look at a replacement, assuming it's still covered under warranty.