The Ryzen desktop CPUs, due in April, will sit alongside current Ryzen 3, Ryzen 5 and Ryzen 7 models for the time being and thankfully the old CPUs will be compatible with new X470 chipset motherboards due out at the same time, plus new CPUs will also work in older AM4 motherboards. The new CPUs sport a number of improvements over AMD's first stab at the Zen architecture. Firstly, they'll now be made using the Zen+ 12nm (originally 14nm) manufacturing process and will offer higher frequencies compared to their predecessors.
In terms of numbers, I spoke to AMD's Jim Anderson who said that AMD plans to launch similar amounts of SKUs to 2017, which will include Ryzen 3, 5 and 7 ranges, but with the addition of APUs for desktop this year too.
As expected following the Ryzen Mobile launch, the new CPUs will also feature Precision Boost 2 and XFR 2, both of which are improved to offer better performance, particularly in tasks that have several light threads such as games - an area that Intel enjoyed a lead in some titles. This was partly due to higher frequencies offered with its CPUs, but also due to the fact that in some games, the original boosting algorithms would see the boost speed fall when a game spawned off light threads.

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