 Its physical placement on the processor imposes some limits on capacity - up to 16 GB at launch, which is much smaller than the capacity of off-package DRAM (384GB).The memory can be partitioned at boot time, with some used as cache for more distant DDR, and the remainder mapped into the physical address space.The application can request pages of virtual memory to be assigned to either the distant DDR directly, to the portion of DDR that is cached by the MCDRAM, or to the portion of the MCDRAM that is not being used as cache.