Sorry to say, it will do nothing at all for you in a server setup. You could run any game server without a graphics card at all and it would make no difference. Game servers would be better served by a good processor and lots of RAM.

The only thing a graphics card could do for you in a server is if you host a media library (e.g. Plex or Jellyfin) and then need to transcode video for a device that can't natively play it (e.g. TV can't natively overlay subtitles, so the server has to burn them into the video that streams to the TV). Another instance could be running image processing on a security camera feed for example.