32-bit processors: P6/Pentium M microarchitecture

(1) Pentium Pro

• Introduced November 1, 1995
• Precursor to Pentium II and III
• Primarily used in server systems
• Socket 8 processor package (387 pins) (Dual SPGA)
• Number of transistors 5.5 million
• Family 6 model 1
• 0.6 µm process technology
• 16 KB L1 cache
• 256 KB integrated L2 cache
• 60 MHz system bus speed
• Variants
• 150 MHz
• 0.35 µm process technology, or 0.35 µm CPU with 0.6 µm L2 cache
• Number of transistors 5.5 million
• 512 KB or 256 KB integrated L2 cache
• 60 or 66 MHz system bus speed
• Variants
• 166 MHz (66 MHz bus speed, 512 KB 0.35 µm cache) Introduced November 1, 1995
• 180 MHz (60 MHz bus speed, 256 KB 0.6 µm cache) Introduced November 1, 1995
• 200 MHz (66 MHz bus speed, 256 KB 0.6 µm cache) Introduced November 1, 1995
• 200 MHz (66 MHz bus speed, 512 KB 0.35 µm cache) Introduced November 1, 1995
• 200 MHz (66 MHz bus speed, 1 MB 0.35 µm cache) Introduced August 18, 1997

(2) Pentium II

• Introduced May 7, 1997
• Pentium Pro with MMX and improved 16-bit performance
• 242-pin Slot 1 (SEC) processor package
• Slot 1
• Number of transistors 7.5 million
• 32 KB L1 cache
• 512 KB ½ speed external L2 cache
• The only Pentium II that did not have the L2 cache at ½ speed of the core was the Pentium II 450 PE.
• Klamath - 0.35 µm process technology (233, 266, 300 MHz)
• 66 MHz system bus speed
• Family 6 model 3
• Variants
• 233 MHz Introduced May 7, 1997
• 266 MHz Introduced May 7, 1997
• 300 MHz Introduced May 7, 1997
• Deschutes - 0.25 µm process technology (333, 350, 400, 450 MHz)
• Introduced January 26, 1998
• 66 MHz system bus speed (333 MHz variant), 100 MHz system bus speed for all models after
• Family 6 model 5
• Variants
• 333 MHz Introduced January 26, 1998
• 350 MHz Introduced April 15, 1998
• 400 MHz Introduced April 15, 1998
• 450 MHz Introduced August 24, 1998
• 233 MHz (Mobile) Introduced April 2, 1998
• 266 MHz (Mobile) Introduced April 2, 1998
• 333 MHz Pentium II Overdrive processor for Socket 8 Introduced August 1, 1998; Engineering Sample Photo
• 300 MHz (Mobile) Introduced September 9, 1998
• 333 MHz (Mobile)