Yeah, I remember hearing something from Tom's Hardware forum's about the inital revision, something about some MSI engineer messing up and making the memory act funny so they had to ditch the 4 DIMM version and stick with 2.
P.S. MSI K7 Master is the best 760 board for those that need Stability over tweakers and ocing options. It does have great Performance also, and it even throws in Multiplier adjustments.