gpu power limit

So, here's the scenario: I need to run a really long render on my MSI GL63 Laptop with a 1660ti. The render might take days and it'll be running 24 hours. I understand 85C is normal for a gaming laptop while gaming but letting it sit at a toasty 85 constantly for numerous days (maybe even a week...

I reciently buy with my brother a GPU, Nvidia 3060 EVGA and i want to see how it react with diferent tasks, games and mining. At the end i want to see what would happend if i overclok and reduce power limit and realize that the voltage became unstable it fluctuate like 100mV (+- 50) and the core...