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The Pentium Pro is a sixth-generation x86 microprocessor developed and manufactured by Intel and introduced on November 1, 1995. [1]: D-2 It introduced the P6 microarchitecture (sometimes termed i686) and was originally intended to replace the original Pentium in a full range of applications.
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]
The Motorola 68020, released in 1984, had a 32-bit address space, giving it a maximum addressable memory limit of 4 GB. All following chips in the Motorola 68000 series inherited this limit. 32 bit addresses, 36 address pins: Pentium Pro (aka P6)
Intel Pentium Pro: 52x P6: 1995–1998 150 MHz – 200 MHz Socket 8: 350 nm, 500 nm 29.2 W – 47 W 1 60 MHz, 66 MHz 16 KiB 256 KiB, 512 KiB, 1024 KiB N/A Pentium II: 52x Klamath Deschutes Tonga Dixon: 1997–1999 233 MHz – 450 MHz Slot 1 MMC-1 MMC-2 Mini-Cartridge: 250 nm, 350 nm 16.8 W – 38.2 W 1 66 MHz, 100 MHz 32KiB 256 KiB – 512 KiB N/A
Many 32-bit computers have 32 physical address bits and are thus limited to 4 GiB (2 32 words) of memory. [3] [4] x86 processors prior to the Pentium Pro have 32 or fewer physical address bits; however, most x86 processors since the Pentium Pro, which was first sold in 1995, have the Physical Address Extension (PAE) mechanism, [5]: 445 which allows addressing up to 64 GiB (2 36 words) of memory.
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 ...
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