When buying a motherboard make sure that you buy one
which will take more RAM in the future than you need at this moment in
time. No matter how much memory you think you will need, you will
need much much more a year down the line.
Once you have your motherboard we recommend that if you're
unsure about what RAM it takes you use the Memory
Selector, that way you are guaranteed to get the right type or your
money back.
Most places will not let you return your RAM if you
accidentally buy the wrong type, Crucial will if you use their Memory
Selector.