I'm toying with the idea of upgrading my amount of ram. I came aross this for my board> MODULES MUST BE ORDERED AND INSTALLED IN PAIRS. This motherboard supports both ECC (X18) and non-ECC (X16) RDRAM. ALL RIMMs MUST be of the same type and installed IN PAIRS. What does it mean by the same type? Is it talking about x18 & x16? Does manufactorer come into it? How do I tell if mine is x18 or x16?