that would depend on the bandwidth that your provider offers, the load that your server will process(ie # of users, etc.)
if,say, worse comes to worst, intermittent connection form server to db would definitely affect your server's performance greatly since,if im not mistaken
sqlDB's work with TCP connection. another thing is that, if your database and server reside far away from each other(as in far far away) delays in queries and writes on your database will also affect your server's performance.
just my 2 cents