[SOLVED] Power Limit Throttling on Intel i5-8250u ?

[derek1036]

Hi, I tried undervolting my laptop for the first time. Its an HP Envy 13 with an i5-8250U processor. I used throttlestop to undervolt CPU Cache, Core, and Intel GPU to -100mV offset voltage. I didn't go beyond -100mV since I got a blue screen when I changed it to -110mV. However, I wasn't content with the temps I was getting since it still reaches up to 89 degrees while gaming. So, I tried adjusting my turbo ratio limits to 29 on all cores on the FIVR tab. Then I ran TSbench at 120M and I noticed on the limits tab that "EDP other" is yellow on core, gpu, and ring. Even when idle, EDP Other remains lit up in yellow. When I run TSbench at 960M however, PL1 and PL2 lights up red for core and gpu. I enabled the "Disable and lock turbo power limits" option in the FIVR tab but it didn't help. Did I do something wrong with 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.
prior to undervolting, I also changed my minimum processor state to 65% when plugged in under the ultimate performance power plan, since I thought it might help lower the temperature because the CPU is always at turbo frequency even at idle or when browsing the web. Nothing changed after I did this though.

 

[uWebb429]

@derek1036
Your screenshot shows power limit throttling at 14.9W.

Intel says the 8250U has a 15W TDP rating. HP has decided to enforce that limit. You cannot use ThrottleStop to go beyond 15W long term. The 15W limit set internally by HP is in control of your CPU.

Nothing changed

Intel CPUs save power by entering one of the low power C states like C7. Slowing a modern Intel CPU down does not make much of a difference when the C states are enabled and the CPU is mostly idle.

Intel's low power 15W U series were never intended for continuously running full load applications or benchmark tests. Most of them will throttle either because of heat or because the turbo power limits are set so low.