First you have to make sure you ram is the correct form, ddr, ddr2, ddr3. If its an older one it probably uses ddr2, possibly ddr but thats pretty rare now. You need to see what the maximum clock speed is for the computer. Lots of them will automatically adjust it down if it is too fast but not all do. Then you have to worry about if your computer uses low or high density ram, which is next to impossible to determine without physically looking at the ram. All in all, it really is best to use a software that matches them for you. Just imagine how you will feel when you purchase ram that isnt compatible. Now that I did some reasarch it looks like your computer is compatable with DDR (yea its old) at 400mhz 184 pin dimm. However this...