I will hopefully upgrade when Haswell-E comes out. It will have DDR4 support but when do you think DDR4 RAM will come out? Crucial's website says late 2013. What do you think, and why?
DDR4 will be out before Haswell-E. It's already being used on a limited basis in particular commercial endeavors, and will be available to consumers just as soon as there is some other consumer hardware to pair it with.