How many slots and what's in them - either of these free tools: Belarc Advisor: http://www.belarc.com/free_download.html FreshDevices FreshDiagnose: http://www.freshdevices.com/freshdiag.html What kind of memory to buy: http://support.dell.com Click on Upgrades under Product Support. Upgrade your system. Input your service tag number, select Memory, and Go, and then Go again. The memory part numbers suggested contain the necessary description information. You can also search for memory based on your computer make/model from any number of online memory vendors, for example: http://www.crucial.com http://18004memory.com/upgrades.asp? Everybody swears by Crucial but IMO the reputation extracts a price penalty. Carl -----Original Message----- From: PCBUILD - Personal Computer Hardware discussion List [mailto:[log in to unmask]] On Behalf Of [log in to unmask] Sent: Tuesday, July 13, 2004 11:56 AM To: [log in to unmask] Subject: [PCBUILD] Memory and DIMMs Hi, How can I tell, with out opening up the PC case, how many of my memory slots are taken up? Also, how can I tell what type of memory I need to buy? I currently have 512mb of RAM and want to install more. Whether it matters, I have a DELL Dimension 4100, running Windows XP Professional. Thanks, Ira Wallin PCBUILD's List Owners: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]> Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://freepctech.com/pcbuild.shtml