The current card is trouble free and I am only considering upgrading it in hope of improving some aspect of performance by taking advantage of newer technology.
Hi,
since Windows Home Server is not meaned to be used as a desktop system with a user sitting in front of it (the most hardware WHS applicances have not even a video adapter built in) there is not much, you would win by upgrading the video adapter.
Maybe less noise due to passive cooling could be an interesting benefit of a new card.
Best greetings from Germany
Olaf