If XT is just $25 extra than X, I would go for XT because it seems they are slightly better binned chips. And various users over Internet have claimed that the later lot of chips hold up higher frequency better than 2019 batch.I was able to pick up a NIB 3900x and NIB 3900XT recently for under retail, the XT $25 more than the X. Based on OC experiences with each chip and price which would you keep? The 3900x is a late 2019 batch number. Only dabbled with an early release 3600x so far which was underwhelming but not bad (reached 1867 IF but couldn’t post above that and all-core OC was relatively low).
I have 3900x bought in Oct 2019 and I believe my chip is average binned, I can run all core 4.25 Ghz at 1.25v stable (not Prime 95 stable). My CR20 score is around 7400 multicore which keeps changing up or down based on the voltage I fiddle with. But I feel my chip runs more stable around 1.3v.
I had even tried Auto OC mode, or EDC bug and had seen all 6 cores on my CCX0 able to reach 4.6 Ghz though not together same time but individually.
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