If single threaded perf is all that matters, probably Epyc 9175F. Zen5, 16 chiplets, one core per. Each core has 32MB of L3. Boosts to 5Ghz. 128 lanes of pci-e 5.0.

If/when they make a v-cache version of this, that'll most likely be even better: Zen5 v-cache doesn't have the clock speed penalty that previous generations did (because the cache is underneath instead of on top) and 96MB of L3 per core would be monstrous.

For what workload?

Probably AMD Turin.