Not all of us are computer geniuses, knowing exactly what speed of RAM (PC100, DDR2, etc.) to put into our machines. This online Kingston Memory Configurator makes it easy by letting you choose your manufacturer and model type, then coming back with the type and speed of memory you need. Once you have that info, you can write it down and head to your favorite shop. You don’t need to buy Kingston brand—although they’d probably like it if you did. It even works with Apple computers.