With X58 the memory controller voltage and mem voltage ratios were within the .5V. That much is obvious and it is also very obvious the difference between the IMC and mem voltage with 1155 in some cases is well outside of the .5V. For the most part the .5V rule was only applicable for users who were going over 1.5V on the x58 IMC which was known as the QPI. I don't think I'll get an answer to my question here. You have not stated how it works; you've just reposted some stock voltages and said nothing about overclocking tolerances.