ASUS must have "sold" the tech to Intel, as Intel now claims "T-Topology" as their own. As to the 4-DIMM thing, and whatever the T-Topology stuff is about, didn't allow ANY of my CPUs to clock memory higher on ANY board with T-Topology. It's written right on this board's surface. I have seen this on other boards, too. Yes, SLI doesn't work with a X4 PCIe link. That's not the board's fault...that an SLI requirement. Crossfire will work with a x4 link, Nvidia says it's not optimal, so they will not support it. Also keep in mind that this is a GAMING board, not a workstation board.