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In computing, Physical Address Extension (PAE), sometimes referred to as Page Address Extension,[1]
is a memory management feature for the x86 architecture. PAE was first introduced by Intel in the Pentium Pro, and later by AMD in the Athlon processor.[2] It defines a page table hierarchy of three levels (instead of two), with table entries of 64 bits each instead of 32, allowing these CPUs to directly access a physical address space larger than 4 gigabytes (232 bytes).
The page table structure used by x86-64 CPUs when operating in long mode further extends the page table hierarchy to four or more levels, extending the virtual address space, and uses additional physical address bits at all levels of the page table, extending the physical address space. It also uses the topmost bit of the 64-bit page table entry as a no-execute or "NX" bit, indicating that code cannot be executed from the associated page. The NX feature is also available in protected mode when these CPUs are running a 32-bit operating system, provided that the operating system enables PAE.
^Dual-Core Intel® Xeon® Processor 2.80 GHz Specification Update(PDF). Intel Corporation. October 2006. p. 18.
^"Appendix E". AMD Athlon™ Processor x86 Code Optimization Guide(PDF) (Revision K ed.). AMD, Inc. February 2002. p. 250. Retrieved 2017-04-13. A 2-bit index consisting of PCD and PWT bits of the page table entry is used to select one of four PAT register fields when PAE (page address extensions) is enabled, or when the PDE doesn't describe a large page.
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In computing, PhysicalAddressExtension (PAE), sometimes referred to as Page AddressExtension, is a memory management feature for the x86 architecture...
Pentium Pro, known as PhysicalAddressExtension (PAE), allows certain 32-bit operating systems to access up to 36-bit memory addresses, even though individual...
certain versions of Windows Server and macOS that allow use of PhysicalAddressExtension (PAE) mode on x86 to access more than 4 GiB of RAM. Whatever the...
1978 as a fully 16-bit extension of Intel's 8-bit 8080 microprocessor, with memory segmentation as a solution for addressing more memory than can be...
virtual addresses based on the existing Large PhysicalAddressExtension (LPAE), which was designed to be easily extended to 64-bit. Extension: Data gathering...
of PhysicalAddressExtension (PAE) can overcome this barrier by extending the addresses used to represent mappings between virtual and physical memory...
Memory privilege to use AWE. On 32-bit systems, AWE depends on PhysicalAddressExtension support when reserving memory above 4 GB. AWE was first introduced...
n-bit addressing may have 2n addressable units of RAM installed. An example is a 32-bit x86 processor with 4 GB and without PhysicalAddressExtension (PAE)...
the PhysicalAddressExtension (PAE), a 36-bit addressing mode. In such a case, a device using DMA with a 32-bit address bus is unable to address memory...
output file format for errors of protein structure prediction PhysicalAddressExtension, an x86 computer processor feature for accessing more than 4 gigabytes...
a larger address space than is available at the process level. Some high-end 32-bit systems (such as those with PhysicalAddressExtension enabled) come...
using PhysicalAddressExtension (PAE) in Pentium Pro and later x86 CPUs to support 36-bit physicaladdresses to address more than 4GB of physical memory...
the 386, but can be larger on newer processors which support PhysicalAddressExtension. The 80386 also introduced two new general-purpose data segment...
burned-in address, or as an Ethernet hardware address, hardware address, or physicaladdress. Each address can be stored in the interface hardware, such...
known as virtual memory addresses, into physicaladdresses in main memory. In modern systems, programs generally have addresses that access the theoretical...
page. This allows a large page to be located in 36-bit address space. If PhysicalAddressExtension (PAE) is used, the size of large pages is reduced from...
IA-32 in all variants, not supported since CentOS 7 IA-32 without PhysicalAddressExtension (PAE), not supported since CentOS 6 IA-64 (Intel Itanium architecture)...
is triggering a failure. /NOPAE – Forces Ntldr to load the non-PhysicalAddressExtension (PAE) version of the Windows kernel, even if the system is detected...
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