In computing, Physical Address Extension (PAE) is a processor feature to enable 32-bit IA-32 central processing units (CPUs) to access physical address space larger than 4 gigabytes by extending the paging schema .[1] It allows up to 64 gigabytes of system memory to be addressed by a 32-bit processor.[2]
PAE was first introduced with the Intel 32-bit processor Pentium Pro.[2] Since then it has been a feature on all Intel processors except some Pentium M mobile processors.[2] Athlon or K7 is the first processor from AMD supported PAE. Now all AMD processors support PAE.[2] In addition to processor support, PAE requires the operating system (OS) to support it.[3] Windows 2000 was the first OS to support PAE.[3]
Desktop Processors
| Processors |
Physical Addressing Bit Width
|
| Intel Pentium Pro/Pentium II/Pentium III/Pentium II Celeron/Celeron |
36 bits
|
| Intel Pentium 4/Pentium 4 Celeron/Pentium D/Celeron D |
36 bits
|
| Intel Core 2/Pentium Dual-Core/Celeron |
36 bits
|
| Intel Core i3/i5/i7/Celeron/Pentium |
36/39 bits
|
| AMD Athlon 64/Athlon X2/Sempron/Sempron X2 |
40 bits
|
| AMD Athlon/Athlon II/Sempron/Sempron X2 |
48 bits
|
| AMD C-50 |
36 bits
|
| AMD APU A4/A5/A6/A8/Athlon/Sempron |
48 bits
|
References
