Memory Details

Guess this question is not specific to SuSe but that is our flavor of Linux in house, so here goes. We are currently running SLES9 and we have one remote server that we will be upgrading the RAM on. The problem is we have no way of knowing what the current type/config of the system ram is. Is there a tool we can use to determine. The number of RAMM slots filled and what types of RAM fill these slots.. I'm assume there is a simple tool for this but I have never needed to use one prior to now. Thanks JAM