I'm noob to PC.. There is something that I still don't understand. I checked my motherboad's characteristic online and it states that if I would want to add additional RAM (DDR), the preferable speed is PC2100, PC2700. However, what will happen if I couldn't get this type of RAM? Will the new RAM still work? And if it works, will it affect its performance? I heard some people said if encounter problem like this, I can separate an empty slot between two RAMs, which means one old RAM, then one empty, then new RAM. Is it true?