I purchased a 2008 Mac Pro recently. And while I am happy to have the space, (I've been stuck on a 2006 Macbook Pro) I want to upgrade the Ram soon. I wasn't aware of how expensive the RAM was until after I bought it. It came with 4 1GB sticks of RAM. Is it possible to install no paired sticks of RAM? I was debating on buying 2X4GB sticks so that I can pull the 1GB sticks out at a later date and upgrade them. My question is, if I buy the 2X4GB sticks, can I keep the 4X1GB sticks in there as well? Or must they all match? I'd hate to just put the 4X1's in a bag in the closet since they work fine. Can you run non matching pairs or RAM in the 2008 Mac Pro?