alt Hacker NewsI don't really see a huge reason to buy this other than it being a top-tier halo product.
For gaming, AMD already pins the game threads to the CCD with the extra cache pretty well.
For multi-threaded workloads the gain from having cache on both CCDs is quite small.
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It really comes down to how much more this CPU is over the next one down if you're building a new rid for a long period of time. I'm running on a 5950X which is coming up on it's 6 years in November. I could have spend a little less on the next model down, but I expect this rig will last me for a few more years (especially with how much memory is). The per year extra expense for that CPU was almost nothing over its lifetime.
Now, would I upgrade an existing computer with a slightly slower processor with it, probably not.
The gain is very workload dependent, so there are no generally-applicable rules.
There are many applications which need synchronization between threads, so the speed of the slowest thread has a disproportionate influence on the performance.
In such applications, on X3D2 the slowest thread has a 3 times bigger cache on an X3D2 vs. X3D. That can make a lot of difference.
So there will be applications with no difference in performance, but also applications with a very large difference in performance, equal to the best performance differences shown by X3D vs. plain 9950X.