Hey I'm not too familiar with RAM other then it's purpose. Can someone explain to me what the difference is between PC2100, PC2700 and PC3200 and all that? Also what is CAS? is it to do with the voltage or something, because the motherboard I was looking into buying says that it can only handle 2.5 Volt memoroy, would that mean that I could only use PC2700 DDR CAS 2.5?