New Mac Pro supports 768GB of RAM

Well physically at least. The Intel Xeon E5 v2 processor housed in the 2013 Mac Pro's tiny shell can address up to 768GB of RAM if space were allotted. Though Mac OS X 10.9 Mavericks so far only reads up to 128GB of Memory. Specifically, Windows 8.1 Enterprise and Professional up's the ante to a full 512GB. So until memory manufacturers releases 128GB sticks to shove into the 4 slots of the Mac Pro, we will wait.