Pentium Pro

Pentium Pro

General information
Launched	November 1, 1995 (28 years ago) (1995-11-01)
Discontinued	June 1998
Marketed by	Intel
Designed by	Intel
Common manufacturer(s)	Intel
CPUID code	0F619h
Product code	80521
Performance
Max. CPU clock rate	150 MHz to 200 MHz
FSB speeds	60 MT/s to 66 MT/s
Data width	64 bits
Address width	36 bits
Virtual address width	32 bits
Cache
L1 cache	16 KB (8 KB instructions + 8 KB data)
L2 cache	256 KB - 1 MB
Architecture and classification
Application	Server Workstation
Technology node	500 nm to 350 nm
Microarchitecture	P6
Instruction set	x86
Physical specifications
Transistors	5.5 million
Cores	1
Socket(s)	Socket 8
History
Predecessor(s)	Pentium
Successor(s)	Pentium II, Pentium II Xeon
Support status
Unsupported

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. Later, it was reduced to a more narrow role as a server and high-end desktop processor. The Pentium Pro was also used in supercomputers, most notably ASCI Red, which used two Pentium Pro CPUs on each computing node and was the first computer to reach over one teraFLOPS in 1996, holding the number one spot in the TOP500 list from 1997 to 2000.^[2]

While the Pentium and Pentium MMX had 3.1 and 4.5 million transistors, respectively, the Pentium Pro contained 5.5 million transistors.^[3]: 12 It was capable of both dual- and quad-processor configurations and only came in one form factor, the relatively large rectangular Socket 8. The Pentium Pro was succeeded by the Pentium II Xeon in 1998.