If you're looking to do a memory upgrade in your computer, why don't you check out the Memory Store? They have a simple setup that is easy to understand by anyone who can use a computer. Say you're looking for IBM memory. Just choose the make and model of your system and all the possible upgrades will be listed for you. How easy is that? This saves you from having to figure out what pin ram you have, then having to search for the right thing. With this site, it gives you all possible matches for your system without the hassle of searching for extra information before you buy.