Hi, i am very new to this forum and currently I have 1 stick of ddr2 ram running at 667. My motherboard allows me to have dual channel memory. I have read that the two sticks of memory have to be exactly he same for the dual channel memory to work. So my question is, can I add another stick of ram that has the same specifications and put it in the other slot? or do I have to go out and buy dual channel memory?