Oh, thanks. The gpu i'll be buying is a RX 580. So the only thing i'll have to do is, install the discrete gpu, boot up pc, intall rx 580 drivers then turn off pc and move the monitor cable onto the dgpu and boot up? -Edited- I've done some research and the rx 580 doesn't have a vga port and my main monitor only has vga port, so will it be compatible??Nothing special really needs to be done if adding an AMD GPU. Typically I keep the monitor on the integrated GPU, install the new discrete GPU, boot up, install drivers, and then move the monitor over to the discrete GPU. Some boards want you to disable the integrated GPU, but I have personally only seen this with Intel chipsets (My current gaming box had to have this done).
Now where things can get tricky is if you are wanting an nVidia GPU. Then the integrated GPU may have to be disabled in EFI, and the AMD GPU drivers uninstalled.
You may want to consider getting a new display in addiction to the dGPU you are getting. What resolution are you currently using?Oh, thanks. The gpu i'll be buying is a RX 580. So the only thing i'll have to do is, install the discrete gpu, boot up pc, intall rx 580 drivers then turn off pc and move the monitor cable onto the dgpu and boot up? -Edited- I've done some research and the rx 580 doesn't have a vga port and my main monitor only has vga port, so will it be compatible??