A Nvidia Card would be ok if the server would be used as Application Server, as example. Normally a Linux Server would be ways better and for sure, much more secure! Windows based server are very expensive in many means, and it doesn't matter if used as Cache or Application Server or something else. And last but not least, also the maintance of a Windows Server would could much more time and effort, by much less security! That he didn't has any knowledge about Servers, is easy to see. Just, we all have started one time from Ground Zero and should never forget that!