The multi-core performance enhancements in the 8.x patches have been fairly substantial. I benchmarked some quick and dirty results on a 4.5 GHz 9900K with a 2080 Ti and render scale set to 0.25 to ensure that CPU was the bottleneck.
I probably should have thrown a 2-core/4-threads result in there as well. I’ll do that if I rerun it sometime. Regardless, WoW scales very comfortably up to four cores, and then sees marginal improvements beyond that. There are no doubt situations where scaling will be somewhat different, possibly pushing even higher minimums with additional cores.