Power Limit Throttling on Intel i5-8250u
Power Limit Throttling on Intel i5-8250u
Hi, I attempted undervolting my laptop for the first time. It's an HP Envy 13 with an i5-8250U processor. I applied throttle stop to reduce the voltage of the CPU cache, core, and Intel GPU by -100mV. I stopped before reaching -100mV because a blue screen appeared when I lowered it to -110mV. Nonetheless, the temperatures remained high, reaching up to 89 degrees during gaming. I then adjusted the turbo ratio limits to 29 for all cores in the FIVR settings. After that, I ran TSbench at 120M and observed that the "EDP other" indicator was yellow on the core, GPU, and ring sections. Even when idle, it stayed lit up in yellow. When I tested at 960M, PL1 and PL2 lights turned red for both core and GPU. I enabled the "Disable and lock turbo power limits" option in the FIVR tab, but it didn’t resolve the issue. Did I make a mistake during the process?
Here are some images from throttlestop:
https://imgur.com/a/HtQTIjv
View: https://imgur.com/a/HtQTIjv
https://imgur.com/j6okdaT
View: https://imgur.com/j6okdaT
https://imgur.com/a/n1xGu7f
View: https://imgur.com/a/n1xGu7f
P.S.
Before undervolting, I also set my minimum processor state to 65% when connected under the ultimate performance power plan, hoping it would help lower the temperature since the CPU stays at turbo even when idle or browsing. However, nothing changed after that.
Your screenshot indicates power throttling at 14.9W. Intel claims the 8250U has a 15W TDP, and HP is enforcing this cap. You should not use ThrottleStop to exceed 15W in the long term. The internal 15W limit set by HP controls your CPU's power usage.
Intel CPUs reduce energy consumption by entering low-power states such as C7. Slowing a modern Intel CPU with these states enabled doesn't significantly impact performance since the CPU is mostly idle.
The low-power 15W U series from Intel were never meant for continuous full-load tasks or benchmarking. They tend to throttle due to heat or turbo power restrictions.
Your screenshot indicates power throttling at 14.9W. Intel claims the 8250U has a 15W TDP, and HP is enforcing this cap. You should not use ThrottleStop to exceed 15W in the long term. The internal 15W limit from HP controls your CPU's performance. Intel CPUs reduce power by entering low-power states such as C7. Slowing down a modern Intel CPU with these settings doesn't significantly impact efficiency, especially when the CPU is mostly idle. Intel's low-power 15W U series were never meant for continuous high-load tasks or benchmarking. They tend to throttle due to heat or restrictive turbo limits.