CPU operating at minimal clock frequency of 2.1GHz while under stress
CPU operating at minimal clock frequency of 2.1GHz while under stress
Product details: Acer Helios 300 PH315-52 CPU with i7-9750H base clock at 2.6GHz and turbo boost up to 4.5GHz. System runs at 4.2GHz during idle, but slows to below 2.1GHz when playing games or running stress tests like AIDA64. Applied liquid metal, removed all thermal paste, pads, and putty from the cores. Observed a temperature drop of about 15°C. CPU isn't throttling thermally, but current limit throttling is occurring. Initially suspected BIOS issue, but after unlocking it didn't resolve the problem. Seeking assistance from Linux FourM, any advice would be greatly appreciated.
No, the outcome might differ when running only the CPU stress test versus including the GPU. It could lack sufficient power to operate both components at full speed.
Navigate to power settings and verify your plan is configured for high performance or another option besides power saver.
ThrottleStop 9.3 https://www.techpowerup.com/download/tec...ottlestop/ Access the TPL window and adjust Power Limit 4 to its highest setting, 1023. Launch the FIVR window and configure Core and Cache IccMax to its maximum, 255.75. This may assist in resolving current limit throttling issues. Also verify the FIVR Disable and Lock Turbo Power Limits section. Many Acer models with the 9750H are capped at 45W. This is the Intel-rated TDP. These processors can operate at 80W or 90W. When restricted to 45W, they will reduce speed to stay within the limit. If you review the ThrottleStop Limit Reasons window, it will explain why your CPU is throttling. Capture some screenshots of this program with Limit Reasons active while your CPU is running. You may also enable the Log File option to keep a log of your CPU performance and any throttling events.
The screenshot indicates PL1 is configured at 45W and CPU throttling hits 44.9W. Everything seems to function properly. In the long run, many Acer laptops cap performance at 45W TDP. ThrottleStop records a peak of 56.0W, while PL2 is set to 56W. Your images don’t display any current limit restrictions—just power limit throttling. Acer probably established these limits internally, preventing changes via ThrottleStop.
It makes sense why we're at 3.3GHz. It's possible the ceramic SMD capacitor on the board was damaged near a core, which could affect performance. The size of the capacitor before damage was similar to nearby components.