1Can I power a GPU with an external power supply?
2Do graphics cards need external power?
In fact, if you don’t connect the PCI-E power cables, your PC will be unable to boot.
With your graphics card installed and working, you can finish the job by relocating your case’s side panel and inserting your display cable into your new graphics card. Turn on your computer.
Now is the time to worry about the graphics card’s software.
Brad Chacos/IDG The Sapphire Nitro+ Radeon RX 6800 XT was plugged in and powered on.
This procedure is straightforward if your new graphics card is the same brand as your old card. To get the most recent driver package for your operating system, go to the manufacturer’s website and download the latest driver version for your operating system. Keep in mind that graphics drivers are usually large, about 500MB in size, and that downloading may take some time depending on your Internet connection.