I dont think the old vid card would matter if it is being used as a server. All you need on the server end, vid wise is to make sure everything is working. It is not like you watch everyone play on the server, you use the video to check files, folders, stats, etc.... so the video card shouldnt matter. I would worry more about network stuff, because that would be the major hangup. Linux would be great, like as already stated, if you can find support for the hardware in it.