Acer Swift 3 - Power Limit Throttling Issue On XTU

muhlisgursoy

Hi,

I have an Acer Swift 3 (SF315-52G) with Intel i5-8250U CPU. Recently, I tried out the Intel XTU software to undervolting my laptop. At first, I ran a stress test on my CPU and noticed it score a 2.84 GHz maximum "max core frequency" and 64°C maximum package temperature.

Then, I tried -0,100 V (undervolting). I ran a stress test again and it scored a 3.03 GHz maximum "max core frequency" (the average is much higher now) and the same 64°C maximum package temperature.

But it still can't reach 3.4 GHz on 100% CPU utilization (or at least 3.3 GHz). I also notice that power limit throttling is on when frequencies drop (no matter it's on default or undervolted). In the picture; green is before undervolting and yellow is after undervolting.

Why my laptop keeps power limit throttling, even the package temperature doesn't touch 70°C at all? Keep in mind, I only changed the core voltage offset (same goes to cache voltage offset), nothing else.

Thanks.

JackE

ACER BIOS firmware typically limits max frequency by 10-20% for laptop CPUs for reliability. Jack E/NJ