Resuming from a parked state has a latency cost that can affect performance, too. On an 8C16T AMD Ryzen 7 1800X, for example, logical processor 0 (physical core) and logical processor 1 (SMT core) stay awake, while the remaining 14 logical processors can be parked at any time. ![]() Secondly, the default Balanced plan attempts to park all logical processors beyond the first 10% whenever possible. This can sometimes limit how quickly our processor responds to “go faster” promptings from high-demand applications. ![]() The Windows-default Balanced plan, in the interest of balancing power and performance, sets higher thresholds and longer timers for transitions into faster P-states than the High Performance plan. Processors receive these requests all the time, and act on them by selecting matching states built into the hardware. Transitions between frequencies and voltages are governed by “P-States.” P-states are frequency/voltage combinations requested by the operating system. After all, nothing knows the hardware better than the hardware itself! However, this intended functionality depends on the integrated power management in Ryzen being in absolute control. These changes can occur as quickly as 1 millisecond on an AMD Ryzen CPU. A little background is neededĪMD Ryzen processors feature AMD SenseMI technology, a sophisticated package of sensing and adapting features that (amongst other capabilities) allow the underlying microarchitecture to rapidly execute fine adjustments to voltage and frequency for peak performance. ![]() We took that challenge seriously, committed to finding a solution by the first week of April, and today we believe we have the answer. But the out-of-the-box power plan for Windows 10 is “Balanced,” so the community challenged us to find a compromise. The reason is clear: testing conducted by AMD, and independent reviewers, have concluded that the High Performance power plan offers appreciable performance benefits to our customers. Throughout the launch of the AMD Ryzen™ processor, AMD has been clear that desktop PC customers should choose the “High Performance” power plan in Windows® 10.
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