by default mssql server will use all available ram on a server for sql query caching. if you look at sqlservr.exe in task manager/processes it will typically say its using 128mb ram, but this is misleading. goto sql management studio and limit the amount of ram that it is allowed to use and you will see the ram use on your virtual center server immediately drop. from sql management studio right click on your sql server and goto properties - what you are looking for is the memory tab - on an 8gb server i would only allow it to use 2048mb max (not the 2tb that is the default). my virtual center is on a hard blade with 32gb ram so i configured sql server to use a maximum of 12gb.
--scott