The ram should have a sticker on the module that will tell you exactly what it is and the timings. Most motherboards have 4 slots. 2 slots will be one color and the other 2 will be a different color. each color is a channel. so you would want to put 2 sticks of ram in the same color sockets. Download this free program, CPUz
. It will tell you what kind of ram you jave installed in each slot, It is a good program. It will also tell you about your motherboard, CPU memory and graphics. The memory tab will tell you what type of ram (DDR2, DDR3) and whether it is in dual channel mode. Also, it would help if you went to the user CP link at the top of this page and filled out your system details. It helps when you ask questions.