it is where the cpu gets stuck on 800mhz for ~2 minutes due to temperature, and it sticks there until the temps are down to 60c, unlike normal intel processors that throttle allot more reasonably by default.
https://www.notebookcheck.net/Lenovo-Th ... 450.0.html
"We can, however, see a drastic clock reduction of the processor to 800 MHz under maximum load (FurMark and Prime95 simultaneous) for the CPU and Nvidia GPU after 6 minutes. After that there is a continuous fluctuation between 800 MHz and 3,400 MHz, which corresponds with the CPU temperature. You will have to live with 800 MHz for 1-2 minutes as soon as HWinfo shows 99 °C."
The W540/W541's BIOS change log doesn't even seem to mention any sort of throttling in it, so it is very unlikely that it has been fixed.
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