I know there are many factors that likely need to be taken into consideration. But I am wondering how much ram would been needed for a large server with something like 600 accounts. I know when the server has to use swap space the load can go up; Or is this necessarily so? We have another smaller server with only 4GB of ram, and quite a bit of swap is used, but this server is typically fast as ever. Other servers we use has 6GB, but I am thinking about doubling this, or even going up to 18GB for the large server. But of course when ordering ram upgrades, we are not only charged once, but again and again and again on a per month basis. So I don't want to bet-the-farm on this one. Any opinions about this? Thanks much.