Informative article, thanks. So the rated speed on the memory sticks does not really matter. I'm still concerened about compatibility. Looking over the QVL list of compatible memory for the Asrock x58 Extreme, 90% of the serial numbers cannot even be found (on Newegg at least), and the rest are either for 2gb or 4gb kits, never for 6gb. Is this just another example of crap documentation? I imagine significantly more memory sticks work on the motherboard than are listed, but it is still very frustrating that the official list is so useless.