Hello, I am seriously thinking of buying a new Dell Dimension 3000 PC.  I was sorta confused on the memory part.  I comes standard with 256 Single Channel Memory.  But you can upgrade to 512 Dual Channel 400MHz DDR SDRAM memory.  In the computer I have currently I have 2 256MB cards in my Dell Dimension 2400.  Would the new computer come with 1 512 card in the first slot and then nothing in the second slot and could I purchase another card? would it have to be a 512 or could i use my 256 from my 2400?  What kind of memory would I need to buy?  I looked at Staples and found 512 DDR PC3200 would that work even though it did not say SDRAM after it?  Thanks Matt