It ensures that the motherboard, CPU, GPU, storage devices, and peripherals receive stable and reliable voltage, which is vital for system performance and longevity. Modern power supplies come with different efficiency ratings, such as 80 Plus Bronze, Silver, Gold, and Platinum, which indicate how effectively they convert AC power to DC power while minimizing energy loss. In addition to efficiency, wattage is a key factor, as it determines how much power a system can draw safely. Choosing the right power supply involves considering the total power demand of your system, future upgrade plans, and desired stability