I currently own a VAIO VGC-RB33G [SPECIFICATIONS] and want to add some more Memory to it. I opened up the case and noticed that both of the 512mb sticks of RAM were Samsung branded. If I were add more memory to my PC, would I need to use the same brand or would I be able to use another brand? Also, which one would you recommend that I buy? My PC uses DDR 400 (PC3200).