Moved your post to a new thread since the original thread was over 10 years old.
Adding graphics to a server is a matter of trial and error (unless you can use ones that others have verified to work) ... Dell servers (except for the very latest models) were never designed for graphics cards, so there is no way to disable the onboard video in order to force an add-in card to take over, and Dell has not validated any video cards for use in them. In order to get one to work, you need to find a graphics card that is capable of disabling the video itself (which is why trial and error is required).