Yes, I use Furmark and I see that the FPS has a little improvement compared to 115W, but easily get thermal throttling 87C limit after 2-3 minutes and it drops, even with maximum fan speed. I want to do the cooling mod like @kaz26did too but dont know how.
Btw @kaz26, i just did core voltage offset with -500mV to the CPU (i5-11500) and after restarting the laptop, the system POSTed with black screen and shut down after 30 seconds like yours.. You were reprograming the BIOS chip to recover right? Right now im removing the CMOS battery and repeatedly press the power button to drain the remaining energy.