Hi everyone, I have an ASUS P5K SE Motherboard. Currently i have 2 boards of memory (1GB each) installed on the motherboard. Recently i decided i need more RAM memory so i want to buy more. My question is can i fit 2 boards of 2gb each next to the 1gb ones so i can have a total of 6gb of memory? If not which would be the best set-up for me if i want 4 or 6gb or memory? And my second question is what else should i check before buying new memory so that i don't do any mistake? I read some info about my motherboard and i found out that you can only install DDR2 on it, can you confirm that?