Dell OptiPlex 3040 adding Graphic Card May 29, 2021

[@rciorniful]

Hi there and thanks for this great tutorial video. I do have an identical PC Dell OptiPlex 3040 i3 6100 3.7 GHz SFF with 12GB of RAM and planning to replace the existent graphic card. Will the process be the same to follow step by step like in your video if I have already an old graphic card installed in my Dell Optiplex ( a GPU GeForce 8400GS to be more precisely ) and I would like to upgrade with a much performed one? Do I need to perform an uninstalling the driver and the software of old one first or change something in BIOS in order that the new one to be easily recognized or it is just a matter of slot in the new one and it will be ready to go. Any answer and information would be highly appreciated as I will receive the new graphic card this week and I am eager to install it myself. Thank you.

[@tamarapack6780]

Why is mine glitching the only thing it's doing is going black and going to the home screen and the tab only has 4 buttons the buttons are mic checker/ drawer /time/ also a button I don't know what it's called