View Single Post
02 Oct 2011  

Microsoft Community Contributor Award Recipient


In the absence of the /PAE switch, the Windows memory manager is limited to a 4 GB physical address space. Most of that address space is filled with RAM, but not all of it. Memory-mapped devices (such as your video card) will use some of that physical address space, as will the BIOS ROMs. After all the non-memory devices have had their say, there will be less than 4GB of address space available for RAM below the 4GB physical address boundary.
Source: Coding Horror: Dude, Where's My 4 Gigabytes of RAM?
My System SpecsSystem Spec