Memory capacity limit? The Intel Xeon E7-4809 supports 3 terabytes of memory. I don't know servers, but does anyone have a need for more than a terabyte of memory outside of supercomputing?
I was going to say that is on an expensive E7, but it turns out there are inexpensive E5 support up to 1.54TB memory. The E3 is capped to only 64GB though.
From what I've seen, it looks like it'll compete with Intel HEDT parts at a lower price. This should be great for consumers as hopefully Intel will massively drop the prices on those >4-core CPUs.