Or do I have to have 2+2gb? Planning to get the cheapest Mini and only upgrade the RAM to 4gb. Was thinking of getting this http://eshop.macsales.com/item/OWC/1333SAM3S4GB/ Also, The Mini that I buy will have 1gb X 2, and my daughter has an iMac with 4gb. Would it be possible to put the 1gb cards in her iMac? I suppose the iMac has 2+2gb?