Hi Kevin You could take one ram simm out and reboot your computer, it will tell you how much ram you have installed. Then you would know which one is which. Hope the helps Jack Brooks Currently I have 32mb & a 128mb of memory installed into my computer. I would like to remove that 32mb of memory and install another 128mb of memory. My computer uses the PC100 Dimm SDRAM memory. My question is how do I tell the difference between the 32mb of memory and the 128mb of memory that is installed into my computer. I dont want remove the 128mb of memory. I would also like to know after installing the new 128mb of memory. Should my computer just recognize the new memory installed or is there a setup to perform after installing the new memory. Thanks. Kevin Scott PCBUILD maintains hundreds of useful files for download visit our download web page at: http://freepctech.com/downloads.shtml