Most computers contain two or more fans including a cpu fan a chassis fan a power supply fan and a graphics card fan.
Laptop cooling fan hack.
Also you need a laptop cooler that you can buy or make.
If you want to use with laptop power then don t use step up converter just directly connect usb to fans and it will take 0 7a 0 14x5 0 7 speed will be slow.
Make sure the fan on the laptop cooler is placed near the cpu and gpu.
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When you will connect with step up boost converter then it takes about 1 8a current so better to use an external power bank or any phone charger.
In the event of cpu fan failure the components may overheat leading to damage.
Most laptops require you to unscrew some screw s and then you have acess to the main board.
Also you need a good screwdriver so you wont damage the screws.
The computer fan is designed to keep the integral parts of your computer system from overheating.