You do not need to buy the biggest PSU on the shelf. You need one that matches your system's peak power draw.
This is the most critical safety rule.
Current (Amps) works differently than Voltage. what power supply do i need
Here is everything you need to consider to determine exactly what power supply you need. 1. Calculate Your Core Wattage Requirements You do not need to buy the biggest PSU on the shelf
: For most gaming PCs, 650W 80+ Gold is safe and flexible. If you tell me your CPU and GPU, I can give you an exact number. what power supply do i need
In our example, a 550-650W power supply would be a good choice.