What I have is GA-M59SLI-S5 Motherboard, and I have 2x cosair memory stick -- CM2X512A-6200 (which total of 1GB memory).. I think it acts like dual thing. I do want another 1GB ram. My question is here is should I buy 2 stick like what I have currently on my motherboard or just buy 1 stick of ram (total of 1GB) or what your advice? Daryl.