First, we will introduce some terms:
Physical address extension (PAE): Some x86 processor attributes allow the processor to access memory larger than 4 GB. The x86 processor adds some address lines, so after using PAE, you can
Http://en.wikipedia.org/wiki/Physical_Address_Extension
Http://msdn.microsoft.com/en-us/library/aa366796%28v=vs.85%29.aspx
Comparing PAE and other large memory support
PAE, 4-gigabyte tuning (4gt), and address processing wing extensions (AWE) serve different purposes and can be used independently of each other:
- PAE allows the operating system to access and use more than 4 GB of physical memory.
- 4gt increases the portion of the virtual address space that is available to a process from 2 GB to up to 3 GB.
- Awe is a set of APIs that allows a process to allocate nonpaged physical memory and then dynamically map portions of this memory into the virtual address space of the process.