Ok I fully dont understand this.
Please forgive me if this is a really dumb question.
Here is my board. (pic below)
Its an Abit - IS7E
http://www.abit-usa.com/products/mb/products.php?categories=1&model=80
Currently I have 512MB (2X256MB) of PC3200 DDR-400 Installed in it. I am looking at upgrading it to 1 GB. Obviously there are two available slots. Can I just throw a single 512 stick in any one of them (leaving one open) or do I need to match two more 256 or 512 sticks?
Sorry…I should probably know the answer to this 
