Does Cubase benefit from a processor that has hyper threading? If so, in what ways? Say an i5 8600K vs an I7 8700.

Thank you all!

Any program that is multithreaded benefit from HT.
That said, the benefit is not huge and depends on the workload (project).
From my own experience I would say roughly 10 % difference between turning it on or off.
In higher core count cpu’s, you may have to turn it of, Cubase only handles 14 logical cores (as of now).
There is also the 8086k, it’s the same as the 8700k but runs at a higher clock.
Turbo boost should ofcause be turned off on any of these CPU’s and manually clocked to whatever your cooling solution permits.