Mark's Blog : Pushing the Limits of Windows: Physical Memory

Mark's Blog : Pushing the Limits of Windows: Physical Memory: "The Memory Manager keeps track of each page of memory in an array called the PFN database and, for performance, it maps the entire PFN database into virtual memory. Because it represents each page of memory with a 28-byte data structure, the PFN database on a 128GB system requires about 930MB"