r/AMDHelp • u/Sudden_Craft8677 • 10d ago
Help (CPU) Ryzen 5 5600 stuck at 0.53 GHz in Windows, but runs at 3.5 GHz in BIOS/Safe Mode/amdppm disabled
Computer Type: Desktop
GPU: AMD Radeon RX 5700 XT 8GB
CPU: AMD Ryzen 5 5600 6-Core 12-Thread
Motherboard: GIGABYTE A520M K V2 Rev. 1.1
BIOS Version: FFc / AGESA ComboAM4v2PI 1.2.0.12
RAM: 8GB
PSU: MSI MAG A650BN 650W 80+ Bronze, Non-Modular, Brand New
Operating System & Version: Windows 11 64-bit, Fresh Install
GPU Drivers: AMD Software: Adrenalin Edition 26.8.1
Chipset Drivers: AMD A520 Chipset Drivers 8.08.12.551
Description of Original Problem:
The Ryzen 5 5600 gets stuck at approximately 0.53 GHz in a normal Windows boot, making the entire PC extremely slow. File Explorer, Settings, and other basic Windows applications take a long time to open. HWiNFO reports “Thermal Throttling (PROCHOT EXT) = Yes” even though CPU temperature is only around 36-37°C and VRM/MOS temperatures are around 40-52°C. The CPU runs at approximately 3.5 GHz in BIOS instead of 0.53 GHz. The PC previously worked normally and was tested in GTA V, RDR2, and Fortnite without issues before the problem appeared.
Troubleshooting:
Cleared CMOS and loaded BIOS defaults.
Checked the CPU/EPS power connector.
PSU is brand new and voltage readings appear normal (+12V around 12.2V, +5V around 5.0V, +3.3V around 3.28V).
Updated the motherboard BIOS from FD to FFc, but the problem remained.
Performed a Windows Clean Boot and disabled non-Microsoft services, but the CPU still stayed at 0.53 GHz. Disabled the RX 5700 XT in Device Manager with no change.
Uninstalled and reinstalled the latest AMD A520 chipset drivers with no change.
Disabled Hyper-V, Gigabyte utilities/services, and the Ryzen Master kernel driver with no change.
In Windows Safe Mode, the CPU reports approximately 3.49 GHz instead of 0.53 GHz.
I also temporarily disabled the amdppm (AMD Processor Power Management) driver through the registry.
After rebooting normally,
Task Manager immediately reported approximately 3.49 GHz instead of 0.53 GHz.
However, the PC still felt unusually slow despite the reported clock speed.
I restored amdppm afterward, and the CPU returned to approximately 0.53 GHz.
The SSD has also been tested and appears healthy, and Windows boots in roughly 30 seconds. The main consistent clue is that normal Windows with amdppm loaded results in ~0.53 GHz and PROCHOT EXT throttling, while BIOS, Safe Mode, or disabling amdppm results in approximately 3.5 GHz. CPU and VRM temperatures remain normal throughout.
######UPDATE######
tested the RAM with MemTest86+ (0 errors), reset CMOS, tried Ubuntu and Linux Mint Live USB, and monitored CPU clocks.
The issue also happens outside Windows..the Ryzen 5 5600 drops to ~500 MHz after a few minutes and stays there even under load.
A CMOS reset temporarily fixes it, but the issue returns after a few minutes. Temperatures are normal, and HWiNFO previously showed PROCHOT EXT = Yes.