well, good luck with that. although fry's computer guys should be knowledgeable at it, I would not just assume that they give you the right things. I was wondering sometimes that if I ever went to store to ask, maybe they'd purposely tell me the wrong things to sell them to me ... you know the deal with just human nature.... LOL...
But here's easy way to figure out... you should have downloaded CPU-Z, then go through the tabs to get all the specs of your computer (it tells you everything you need to know in terms of motherboard type, memory type your computer supports, how much memory you have, etc) and start from there.