The same step, at two clocks
A lot of server work happens one step at a time on a single thread: an event loop answering requests, a database executing a query, a compiler working through one file. Extra cores let you run more of those side by side, but they do not make any one of them finish sooner. The speed of one core does.
So the clock of that core sets how much work fits in each step. That is why we chose a processor that boosts to 5.7 GHz, and why, for single-thread-bound work, the clock of one core often matters more than how many cores there are.
At the 4.2 GHz base clock3.00 steps in the window
At up to 5.7 GHz boost4.07 steps in the window