Usually it's a single core with the peak boost clock and a multi-core boost that's a bit lower. The i7-8700K for instance is 3.7GHz stock, 4.3 all-core boost, a

Usually it's a single core with the peak boost clock and a multi-core boost that's a bit lower. The i7-8700K for instance is 3.7GHz stock, 4.3 all-core boost, and 4.7 single-core turbo.