AIO liquid coolers, also known as All-In-One liquid coolers, work by using a closed-loop system to transfer heat away from the CPU. The cooler consists of a pump, a radiator, and one or more fans. The pump is located near the CPU and circulates a liquid coolant through the system.
The liquid absorbs heat from the CPU and is then pumped through the radiator, which is usually located at the back or top of the case. The radiator is equipped with one or more fans that blow air over the fins of the radiator, which helps to dissipate the heat absorbed by the liquid coolant. The cooled liquid is then pumped back to the CPU to absorb more heat.
AIO liquid coolers are considered to be more effective at removing heat from the CPU than traditional air coolers, and they are also quieter and take up less space.