Currently it isn't supported to install a 3rd party graphics card for the purpose of replacing the embedded video. On some of the newer 12th generation servers they are supported for processing speed, but not for video uses.
That being said. That doesn't mean that their isn't a card that will work. They just aren't tested by Dell. So we won't be able to provide an answer on a card.Also a note, when you disable the embedded video via the BIOS, the drac will no longer be accessible. As the Drac ties to the embedded video.