I guess the numbers, but the phone body can dissipate something like 1W, the chip can output 5W of heat when fully utilized at max clock, the difference accumul

I guess the numbers, but the phone body can dissipate something like 1W, the chip can output 5W of heat when fully utilized at max clock, the difference accumulates until it shuts down to protect itself from melting. You need active cooling to run it at max clock, and I don't know if the firmware will let you even if the temp sensor says it's fine.