The Xeon Ds have had a max of 128 gigs, or 37 bits of addressing, since they came out last year. For Skylake, they have bumped up the addressibility to 36 bits

The Xeon Ds have had a max of 128 gigs, or 37 bits of addressing, since they came out last year. For Skylake, they have bumped up the addressibility to 36 bits from 35 bits, which is where it had been for a number of processor generations. For the E5 Xeons, the amount of physically addressable RAM is at 46 bits, and has been for a couple generations. Intel's used addressible RAM for a while as one of their segmentation methods to push people towards their higher end if their usage is RAM heavy.