https://www.techpowerup.com/318566/amd-to-fix-ryzen-8000g-desktop-apu-stapm-feature-via-motherboard-bios-updates Skin temperature-aware power management (STAPM), is a 2014 feature introduced by AMD for its mobile processors that gets the on-die power management logic to take into account not just the processor's own temperatures (measured via on-chip thermal diodes); but also the physical surface temperature of the laptop itself, by reading off temperature probes mounted on the laptop chassis. This ensures that laptops don't get uncomfortably hot for the user, and the processor could do its bit to bring temperatures down. Every desktop APU released by AMD since 2014 has been a case of mobile processor silicon being adapted for the desktop platform by simply disabling certain I/O interfaces and features irrelevant to desktops, such as battery management GPIO, LPDDR memory interfaces, image processing, sensor suite, etc. One such feature is STAPM.
Gamers Nexus discovered that when creating the Ryzen 8000G desktop APUs, AMD forgot to properly disable STAPM, and this has been impacting the processor's CPU and iGPU boosting behavior under heavy load, where temperature-triggered clock speed throttling is engaged undesirably. AMD confirmed the Gamers Nexus discovery, and stated that it can be fixed through a motherboard UEFI firmware (BIOS) update; and that it will work with its desktop motherboard partners to get these out. The highest performance delta observed by GN between an 8000G processor with STAPM and one with its STAPM disabled (probably using an AMD CBS setting); is 16%; and so those with 8000G processors may want to look out for firmware updates from their motherboard vendors.
An excellent find by Gamer's Nexus and should be an easy BIOs fix.
