7950x to 9800x3D worth the upgrade?

It's not worth it in either case. For gaming it's not a noticeable enough upgrade and for productivity it would be a downgrade. Top of the line chips from last gen are not meant to be swapped the second the next gen comes out, waste of money.

Upgrade for gaming, large downgrade for workstation type tasks which I assume why you bought the 7950x in the first place.

For your use case wait for the 9950X3D, I think that one is likely a very exciting for AMD's 16 core CPUs. At the very least, 9800X3D has shown that with higher sustained clocks and 3D V-Cache, at the same frequency, you get a very decent uplift over Zen 5 non-X3D CPUs because the architecture is bandwidth starved. I think in more productivity workloads the 9950X3D will perform much better than the 9950X. Especially if the workload is memory bandwidth starved. If they put X3D on both CCDs... it's going to be a literal game changer.

Thanks for the responses fellas. I think I will just keep using my 7950x I primarily game at 1440p 240hz atm. Will probably put the money towards next gpus depending on what they turn out like.

I'm coming from a 3900. Gonna be a good upgrade this winter. Good luck with your machine. What mobo are u getting?

9950x3d is very likely to have cache on both CCDs with higher boost clocks than 9800x3d as well. It's going to be an absolute beast

If you are gaming at 1440p or higher, then likely not. You'd be lucky to see any improvement at all as nearly every title will be GPU locked anyways.

what game and at what resolution
if you talk about 4k games, and aaa games
it's gpu bottleneck, cpu don't make much different especially on top end

if you talk about competitive shooter game
it could make different if you have good "monitor" that can take advantage of cpu
mmo could get heavy benefit too base on how game optimized
bad optimized game usually feel different with better cpu