The power supply unit (PSU) is the heart of every PC. It takes AC power from the wall and converts it to low-voltage DC power, which then goes on power to all your components. So if you want reliable, steady power to your motherboard, CPU, RAM, graphics cards, drives, fans, (and of course!) RGB lights, you need to get a good power supply. It’s tempting to simply think “more is better” and go for the highest wattage number you can find. This would be a big mistake. A 1200-watt power supply is not necessarily higher quality than a 650-watt one, and definitely not the right choice for a system that won’t use nearly that much power.