2 or 4 sticks of 512MB Crucial Ballistix PC-3200. Cheap, tight timings, overclockable. Great memory. Honestly, anything over 1GB of memory right now actually slows down your computer because all that RAM isn't utilized to its full potential with current software. I've heard that anything over 1GB of memory is actually bad for your computer. Might be wrong, might be exceptions, but that's what I've heard on forums. Can't remember where. I'll come back and repost if I come across the same information again.