Physical Address Extension facts for kids

Kids Encyclopedia Facts

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 . It allows up to 64 gigabytes of system memory to be addressed by a 32-bit processor.

PAE was first introduced with the Intel 32-bit processor Pentium Pro. Since then it has been a feature on all Intel processors except some Pentium M mobile processors. Athlon or K7 is the first processor from AMD supported PAE. Now all AMD processors support PAE. In addition to processor support, PAE requires the operating system (OS) to support it. Windows 2000 was the first OS to support PAE.

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

Physical Address Extension Facts for Kids. Kiddle Encyclopedia.