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Intel Pentium P5
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The Intel Pentium Processor
The Intel Pentium is a fifth-generation x86 architecture microprocessor, introduced on March 22, 1993. It is the successor to the 486 line. The Pentium was originally to be named 80586 or i586, but the name was changed to Pentium because numbers could not be trademarked. 586 is however, used in programming referring to all the early Pentium processors, and Pentium-like processors made by the Intel competition.
 
The original Pentium microprocessor had the internal code name P5, and was a pipelined in-order superscalar microprocessor, produced using a 0.8 m process. It was followed by the second generation Pentium P54, a shrink of the P5 to a 0.6 m process, which was dual-processor ready and had an internal clock speed different from the front side bus (it's much more difficult to increase the bus speed than to increase the internal clock). In turn, the P54 was followed by the 3rd generation P54C, which used a 0.35 m process - a pure CMOS process, as opposed to the Bipolar CMOS process that was used for the earlier Pentiums.
 
The early versions of 60-100 MHz Pentiums had a problem in the floating point unit that, in rare cases, resulted in reduced precision of division operations. This bug, discovered in 1994, became known as the Pentium FDIV bug and caused great embarrassment for Intel, which created an exchange program to replace the faulty processors with corrected ones. The 60 and 66 Mhz 0.8 m versions of the Pentium processors were also known for their fragility and their (for the time) high levels of heat production.
 
FDIV-Bug
Following S-Spec numbers are affected:
P5-50:   Q0399
P5-60:   Q0352, Q0394, Q0400, Q0412, Q0466, SX753, SX835, SZ949
P5-66:   Q0353, Q0395, Q0413, Q0467, SX754, SX837, SZ950
P54-75:   Q0540, Q0541, Q0601, Q0606, SX951
P54-90:   Q0542, Q0543, Q0611, Q0612, Q0613, Q0628, SX679, SX874, SX885, SX909, SX921, SX922, SX923, SX942, SX943, SX944, SZ951
P54-100:   Q0563, Q0587, Q0614, Q0677, SX886, SX910, SX960

 
References:  Ars Technica: An Architectural History  Pentium at Wikpedia
Intel Pentium A80501-60
Intel Pentium A80501-60 Top Side A80501-60
L3281604
SX753
INTEL (M) (c) 1992
Intel Pentium A80501-60 Back Side 53160220NA
MALAY
ES 328
INTEL (M) (C) 1992
One of the earlier Pentium 60s, a B1 stepping model. These models suffered from heat troubles and where therefore enhanced with a heat spreader, a flat metal plate designed to distribute heat evenly across the processor surface, in later models of the P5. This item here had a huge cooler mounted on top (which was not easy to unmount ;-). Of course it features the infamous FDIV bug.
 
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Core Frequency:60 MHz
Board Frequency:60 MHz
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,100,000
Circuit Size:0.80
Voltage:5 V
Introduced:March 22, 1993
Manufactured:week 28/1993
Made in:Malaysia
L1 Cache:8+8 KB
CPU Code:Pentium
P5
Intel S-Spec: SX753
Package Type:Ceramic
PGA-273
Socket: 4
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Intel Pentium A80501-60 Goldcap, 'Processor'-Marking
Intel Pentium A80501-60 Goldcap, 'Processor'-Marking Top Side A80501-60
SX835
L4050009
INTEL (M) (C) 1992
Intel Pentium A80501-60 Goldcap, 'Processor'-Marking Back Side 53430560AA
MALAY
F 405
INTEL (M) (C) 1992
An early version of the Pentium 60 with golden heatspreader and 'PROCESSOR'-marking under the 'Pentium' logo. This CPU has the FDIV bug.
 
add comment
Core Frequency:60 MHz
Board Frequency:60 MHz
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,100,000
Circuit Size:0.80
Voltage:5 V
Introduced:March 22, 1993
Manufactured:week 05/1994
Made in:Malaysia
L1 Cache:8+8 KB
CPU Code:Pentium
P5
Intel S-Spec: SX835
Package Type:Ceramic
PGA-273
Goldcap
Socket: 4
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Intel Pentium A80501-60 Goldcap
Intel Pentium A80501-60 Goldcap Top Side A80501-60 SX974
ICOMP INDEX=510
L4473529-0948
INTEL (M) (c) 1992
Intel Pentium A80501-60 Goldcap Back Side 94421454NA
MALAY 452 R
INTEL (M) (c) 1992
A80501-60
SX974
add comment
Core Frequency:60 MHz
Board Frequency:60 MHz
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,100,000
Circuit Size:0.80
Voltage:5 V
Introduced:March 22, 1993
Manufactured:week 47/1994
Made in:Malaysia
L1 Cache:8+8 KB
CPU Code:Pentium
P5
Intel S-Spec: SX974
Package Type:Ceramic
PGA-273
Goldcap
Socket: 4
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Intel Pentium A80501-66 Goldcap
Intel Pentium A80501-66 Goldcap Top Side A80501-66 SX950
ICOMP INDEX=567
L50111934-0636
INTEL (M) (C) 1992
Intel Pentium A80501-66 Goldcap Back Side 94393716AA
MALAY 511 S
INTEL (M) (C) 1992
A80501-66
SX950
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Core Frequency:66 MHz
Board Frequency:66 MHz
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,100,000
Circuit Size:0.80
Voltage:5 V
Introduced:March 22, 1993
Manufactured:week 01/1995
Made in:Malaysia
L1 Cache:8+8 KB
CPU Code:Pentium
P5
Intel S-Spec: SX950
Package Type:Ceramic
PGA-273
Goldcap
Socket: 4
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