How to check the CPU temperature in real time without using any software!

If we're talking about a standard configuration (and forced air cooling is exactly that), then nothing needs to be removed. But if you're planning to install additional fans where they weren't originally, then it depends on the situation. In fact, you could even create a liquid nitrogen cooling system, or connect the system to a water source from a battery, and do many other things. These are the real overclocking tricks. Compared to that, coolers seem like child's play.