Of course, it is not about the famous Turbo button from Intel 386 computers, but Turbo Boost on the new Core i5 and i7 processors. This feature causes an increase in the processor’s clock frequency to increase its performance. Of course, this frequency was dependent on the number of used cores at the same time, so Intel had to provide in the processor specifications individual values. However, with the advent of the Coffee Lake family, there was only information about the frequency of operation in Turbo mode using a single core.

Turbo Boost was introduced by Intel in the fall of 2008 in the first Core i7 processors (Bloomfield family). It allowed to increase the clock frequency only when a single-core was used. However, this technique was later refined, which allowed for more efficiency in increasing the number of cores. There was a simple and intuitive principle here. Higher amount of used cores translates into lower maximum frequency resulting from Turbo Boost. Many users rated the CPU clock frequency during the various scenarios. However, this information will no longer be published for new layouts.

Intel Turbo Boost

Intel in specification of Coffee Lake family, CPUs provides Turbo Boost frequency only for core load.

In summary, Intel will now announce the maximum clocking frequency of its processors for two cases: at all loads (this is called base frequency) or a single core (that is, the Turbo frequency). For most users this is not a problem, but more advanced customers would also like to know how their processor will behave with an application that loads only two cores, for example. This type of information is useful for developers and people who use computers for simulations, numerical methods calculations etc. Intel, however, is explaining that it is not able to provide more detailed information about the Turbo Boost modes, because the CPU clock frequency depends on a number of factors, including the temperature and the load of the individual cores. Fortunately, not everything is lost. Intel is unlikely to change its mind, but some reviewers of new processors will try to determine the impact of the number of cores on their frequency. This information for 8 generation of Intel CPUs was included in AnandTech review.

Coffee Lake Turbo

Source: eTeknix, AnandTech