Hi all,\nI have an nvidia nforce2 ultra 400 main board. Currently I have 1 stick of kingston 256 sdram 333mhz pc2700 installed. I've looked around and found good prices on kingston sdram from kingston.com and want to upgrade soon. Can I put in a stick of 512sdram with the above specs or will it not work with 2 different sizes of sdram sticks. Do I need to match the 256? It seems that people with odd or non matching memory have problems. How do you way in? Thanks.