We have a server that has 24gigs installed and Windows Server 2008 Standard 64-bit installed on it. The 24gigs are detected under control panel/system, but it only uses 8gigs. We can see this both in the task manager and in winver.exe, and by the fact that the server has run out of memory. :)
We're totally stumped as why this is, so we're greatful for any pointers.