We’ll quote directly from AMD’s review documentation so that there is no room for confusion: What PBO does not ever do is boost the frequency beyond the advertised CPU clocks, which is a major point that people have confused. Precision Boost is enabled on a stock CPU, Precision Boost Overdrive is not. Precision Boost takes into account three numbers in deciding how many cores can boost and when, and those numbers are PPT, TDC, and EDC, as well as temperature and the chip’s max boost clock. XFR was introduced with the first Ryzen series CPUs. “Precision Boost” is not an abbreviation for “Precision Boost Overdrive,” it’s actually a different thing: Precision Boost is like XFR, AMD’s Extended Frequency Range boosting table for boosting a limited number of cores when possible. PBO is explicitly different from Precision Boost and Precision Boost 2, which is where a lot of people get confused. Precision Boost Overdrive is a technology new to Ryzen desktop processors, having first been introduced in Threadripper chips technically, Ryzen 3000 uses Precision Boost 2. Today, we’re demystifying these names and demonstrating the basic behaviors of each solution as tested on two motherboards. With the launch of the Ryzen 3000 series processors, we’ve noticed a distinct confusion among readers and viewers when it comes to the phrases “Precision Boost 2,” “XFR,” “Precision Boost Overdrive,” which is different from Precision Boost, and “AutoOC.” There is also a lot of confusion about what’s considered stock, what PBO even does or if it works at all, and how thermals impact frequency of Ryzen CPUs.
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