System performance altered following Windows 11 update on 5600G device. Issue resolved.
System performance altered following Windows 11 update on 5600G device. Issue resolved.
I've been troubleshooting this for a while so I'll try to summarize it: - 5600G with an Asrock B550 motherboard, Windows 10 Pro 22H2 - Always-on system, so I used to check out the idle performance, HWInfo reported CPU package power around 5W, when left alone recording a minimum of 4.5W - In Task manager, CPU clocks would drop to 2.34GHz on idle, Power Saver power plan - Update to Windows 11 from the Windows Update screen - CPU now never drops below 6W, in Task Manager the clocks never go below ~3.2GHz - On a separate drive partition I installed a clean Windows 11, seems to behave the same as the main system - On another partition I installed a clean Windows 10, PERPLEXINGLY it ALSO seems to behave about the same - power draw is a little bit lower, clocks about the same on the slightly lower side (still nowhere near 2.34GHz) - Noticed that C-state residency is always 0% in C6. Went to BIOS and enabled the setting, it was DISABLED - Now the clean Windows 10 install drops down to 3.5W, instead of 4.5 when my main system was on Windows 10, and the clocks STILL don't drop below ~3.2GHz Something is fu*ky here. I'm 90% sure that C-state BIOS setting was never Enabled, since the Windows 11 update couldn't have disabled it AND if it was enabled the old Windows 10 system would have dropped to a lower power draw like the new clean Windows 10 AND the dirty Windows 11 systems do. I'm beyond confused here. I tried to roll back the Windows 11 update but I'm getting some stupid error about the needed files missing, despite the Windows.old folder being present, it's been less than 10 days. Using the Advanced menu has no 'Uninstall Updates' option so idk... PS - obviously on all these systems I have the newest AMD chipset drivers installed using the AMD Adrenalin installer - Full Install option and latest Windows updates
Updated the two Windows 10 machines to match a single build (19045.3086). Exported the power plan from the original Windows 10 setup. The clean installation continues running at increased voltage and clock speed, with images showing the original system versus the new one: Spoiler Original Windows 10 system Clean Windows 10 install, note higher VID and overall clock speeds (and power draw in the little tray icon).
Notably, each system behaves similarly for a short period after startup, keeping clock speeds near 4GHz even when idle. However, around 1:30 the behavior shifts abruptly—voltage and core clocks reset to lower values. Windows 10 also shows distinct differences: it tends to keep clock speeds below 2.6GHz during light tasks or short bursts, slowly increasing to full performance under sustained load, whereas a clean system quickly jumps to 4GHz and beyond as soon as any workload appears. This inconsistency across identical hardware and settings is quite unusual.
Solved! Wow, what a rabbit hole! Thanks to the amazing person who built this tool, I can fine-tune the power plans with a lot of precision—super cool! https://forums.guru3d.com/threads/window...ty.416058/ But more importantly, the write-up highlights the "Processor performance autonomous mode" setting in the plan, which appears to be the main factor here. When I turn that setting off on Windows 11, I see the full power plan performance as defined by the settings, rather than the strange behavior caused by the newer system (which leads to higher idle voltage and core clocks). This CPPC version 2 essentially takes over most of the power plan adjustments (something the tool lets you customize completely), making it very useful for anyone moving to Windows 11. I really hope this helps someone else figure out why their CPU isn’t acting as expected.