The power supply is one of the parts that you don't want to cheap out on at all in a custom PC. If you get one that isn't powerful enough, some parts may become damaged. I can help you out and give you the best options that can handle high power machines!
When you're combining a high-end CPU with a high-end video card like a AMD Radeon RX 6800 or an nVidia 3080... then you need a lot of power.
CORSAIR - RMx Series 850W ATX12V 2.4/EPS12V 2.92 80 Plus Gold Modular Power Supply
This power supply is very reliable with the power of 850W. This wattage is more than enough for any decently powerful PC. Made with industrial-grade components, this power supply won't let you down.
CORSAIR - RMx Series 1000W ATX12V 2.4/EPS12V 2.92 80 Plus Gold Modular Power Supply
This power supply is essentially the same as the previous one, just with more power. It has 1000W which is 150 more than the other one. If your computer is packing extremely high-end equipment then you. may need to spend a few more bucks and go with this one.