I don't know if it's stupid to ask this kind of question, but I feel like I have no other option. My laptop is a Dell Vostro 3520 with an i7-1255U processor and an MX550 GPU, which together get so hot they almost cause a nuclear fusion. The processor reaches 100°C in seconds even on the CPU-Z benchmark which, although it's a benchmark and stresses the CPU a lot, shows that the cooling system can't handle a few seconds of high stress. I know people blamed the thermal paste (which, by the way, has more than 15.9 W/m·K and was replaced a month ago), fan cleaning (it was cleaned at the same time I replaced the thermal paste), or the ambient temperature (which is currently 25°C). But I maintain that it's none of those. Others will say to set Thermal Management in the BIOS to Ultra Performance — which I already did; in fact I believe I've done almost everything regarding adjusting the processor's power supply or thermal settings.
One detail I find interesting is that after throttling, the processor’s power consumption stays locked at 12W with clocks varying between 1.6 GHz and 4.0 GHz depending on the load I put on it (its Turbo Boost is 4.7 GHz). Also, when I stress both the CPU and GPU I basically see the following behavior: the processor shows the behavior described above with temperatures ranging from 75°C to 80°C and sometimes higher, while the GPU reaches 87°C hotspot at 100% usage.
I'm posting mainly to see if anyone knows a method to undervolt this specific laptop, since the methods I've found for Dell laptops are all for H-series processors and different models, and they show how to regain control over the CPU voltages rather than how to unlock them.