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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 ]
Physical Address Extension, an x86 computer processor feature for accessing more than 4 gigabytes of RAM; Power added efficiency, a percentage that rates the efficiency of a power amplifier; Post Antibiotic Effect, the period of time following removal of an antibiotic drug during which there is no growth of the target organism
Physical Address Extension or PAE was first added in the Intel Pentium Pro, and later by AMD in the Athlon processors, [47] to allow up to 64 GB of RAM to be addressed. Without PAE, physical RAM in 32-bit protected mode is usually limited to 4 GB. PAE defines a different page table structure with wider page table entries and a third level of ...
A workaround first developed in the Pentium Pro, known as Physical Address Extension (PAE), allows certain 32-bit operating systems to access up to 36-bit memory addresses, even though individual programs are still limited to operating within 32 bits of address space. Provided there is enough memory installed, each program can have its own four ...
4: PSE: Page Size Extension: If set, enables 32-bit paging mode to use 4 MiB huge pages in addition to 4 KiB pages. If PAE is enabled or the processor is in x86-64 long mode this bit is ignored. [14] 5: PAE: Physical Address Extension: If set, changes page table layout to translate 32-bit virtual addresses into extended 36-bit physical ...
This allows a large page to be located in 36-bit address space. If Physical Address Extension (PAE) is used, the size of large pages is reduced from 4 MiB down to 2 MiB, and PSE is always enabled, regardless of the PSE bit in CR4.
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Limits on physical memory for 32-bit platforms also depend on the presence and use of Physical Address Extension (PAE), which allows 32-bit systems to use more than 4 GB of physical memory. PAE and 64-bit systems may be able to address up to the full address space of the x86 processor.