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IBM 6x86
  IBM 6x86 w/o P-Rating
  IBM 6x86 P120+
  IBM 6x86 P150+
  IBM 6x86 P166+
  IBM 6x86 P166+, 3.5V
  IBM 6x86 P200+
  IBM 6x86L P150+
  IBM 6x86L PR166+
  IBM 6x86L PR200+
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The IBM/Cyrix 6x86 Processor
The IBM 6x86 is in fact an IBM manufactured and labelled Cyrix 6x86. Cyrix entered the fifth generation processor market with the 6x86 processor, formerly projected as the M1. As a successful and cheaper (often less than half the cost) alternative to the Intel Pentium, it is pin- and voltage-compatible with it. Cyrix gave it the 6x86 name in reference to some of its more advanced features, which it calls "sixth generation". In reality, the processor is comparable in power and architecture to the fifth-generation Pentium.
 
The 6x86 is not a Pentium clone. Clones are exact or near-exact copies, usually being reversed engineered or based on licensed code. The 6x86 is based on an original Cyrix design. It incorporates several advanced architectural features that allow it to outperform a Pentium of equal clock speed. For this reason Cyrix helped invent the "P-Rating" system. This was an advantage to help people make a valid comparism but also caused some confusion when setting the appropriate clock speed on the motherboard.
 
The Cyrix 6x86 range has the most powerful processor core of any x86 processor of its generation. Unfortunately, like the AMD K5, it also has a very slow floating point math capability and so was a very poor games and 3D performer.
 
The processor is designed for Socket 7 and is available in several clock speeds, some of them rather unusual. The 6x86 PR200 (150 Mhz) processor introduced non-standard bus speeds up to 75 MHz - many motherboards and PCI cards did not support this speeds: Since the PCI bus runs at half of the mainboard bus speed, you are increasing the PCI bus to 37.5 MHz with a bus speed of 75 MHz. Several PCI cards, especially some graphics cards, did not run correctly with this overclocked bus.
 
References:  Cyrix 6x86 Processor Brief  Cyrix 6x86 Processor FAQ  Cyrix Press Releases
IBM 6x86 w/o P-Rating
IBM 6x86 w/o P-Rating Top Side
IBM 6x86
IBM26 6x86-2V2100GB
IBM 6x86 w/o P-Rating Back Side
COPYRIGHT USA
1995 CYRIX
IBM9314 Q10032
75H1233 PQ
The IBM 6x86 is a Cyrix processor made by IBM and sold under their own label.
 
This is a very early version without the 6x86 logo and P-Rating.
 
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Core Frequency:100 MHz
Board Frequency:50 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.65 µ
Voltage:3.3 V
Introduced:02/1996
L1 Cache:16 KB
CPU Code:M1R
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86 P120+
IBM 6x86 P120+ Top Side
IBM 6x86 P120+
IBM26 6x86-2V2100GB
IBM 6x86 P120+ Back Side
COPYRIGHT USA
1995 CYRIX
IBM9314 Q16042
57H1233 PQ
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Core Frequency:100 MHz
Board Frequency:50 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.65 µ
Voltage:3.3 V
Introduced:02/1996
L1 Cache:16 KB
CPU Code:M1R
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86 P150+
IBM 6x86 P150+ Top Side
IBM 6x86 P150+
IBM26 6x86-2V2P150GE
120 MHZ-3.3V
IBM 6x86 P150+ Back Side
COPYRIGHT USA
1995 CYRIX
IBM9314 Q47040
88H1547 PQ
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Core Frequency:120 MHz
Board Frequency:60 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.65 µ
Voltage:3.3 V
Introduced:02/1996
Manufactured:week 04/1997
Made in:USA
L1 Cache:16 KB
CPU Code:M1R
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86 P166+
IBM 6x86 P166+ Top Side
IBM 6x86 P166+
IBM26 6x86-2V2P166GE
133 MHZ-3.3V
IBM 6x86 P166+ Back Side
COPYRIGHT USA
1995 CYRIX
IBM9314 Q36053
88H1205 P9
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Core Frequency:133 MHz
Board Frequency:66 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.65 µ
Voltage:3.3 V
Introduced:02/1996
L1 Cache:16 KB
CPU Code:M1R
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86 P166+, 3.5V
IBM 6x86 P166+, 3.5V Top Side
IBM 6x86 P166+
IBM26 6x86-2V7P166GE
133 MHZ/3.5V
IBM 6x86 P166+, 3.5V Back Side
COPYRIGHT USA
1995 CYRIX
IBM9314 Q48031
88H1538 PQ
This is a 2V7P version with 3.5V (Standard is 3.3V)
 
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Core Frequency:133 MHz
Board Frequency:66 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.65 µ
Voltage:3.5 V
Introduced:02/1996
Manufactured:week 38/1995
L1 Cache:16 KB
CPU Code:M1R
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86 P200+
IBM 6x86 P200+ Top Side
IBM 6x86 P200+
IBM26 6x86-2V7P200GE
150 MHZ-3.5V
IBM 6x86 P200+ Back Side
COPYRIGHT USA
1995 CYRIX
IBM9314 R02070
88H1327 PQ
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Core Frequency:150 MHz
Board Frequency:60 MHz
Clock Multiplier:2.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.35 µ
Voltage:3.5 V
Introduced:02/1996
L1 Cache:16 KB
CPU Code:M1R
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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The earlier versions of the 6x86 had problems with heat and power consumption. Responding to customer complaints, Cyrix came out with a lower powered version called the 6x86L. This processor reduces power consumption by 25% or more compared to the original 6x86. It uses a smaller, 0.35 micron circuit size and split voltage much like the Pentium MMX (3.3V external, 2.8V internal).
IBM 6x86L P150+
IBM 6x86L P150+ Top Side
IBM 6x86L P150+
IBM26 6x86L-2VAP150GB
120 MHZ-2.8V CORE
IBM 6x86L P150+ Back Side
COPYRIGHT USA
1996 CYRIX
IBM9314 R05017
88H2295 PQ
Donated by Sascha Reißner. Thanks a lot!  
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Core Frequency:120 MHz
Board Frequency:60 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.35 µ
Core / I/O Voltage:2.8 / 3.3 V
Introduced:02/1996
L1 Cache:16 KB
CPU Code:M1R
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86L PR166+
IBM 6x86L PR166+ Top Side
IBM 6x86L PR166+
IBM26 6x86L-2VAP166GB
133 MHZ-2.8V CORE
IBM 6x86L PR166+ Back Side
COPYRIGHT USA
1995 CYRIX
IBM9314 M12022
88H3468 PQ
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Core Frequency:133 MHz
Board Frequency:66 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.35 µ
Core / I/O Voltage:2.8 / 3.3 V
Introduced:02/1996
L1 Cache:16 KB
CPU Code:M1R
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86L PR200+
IBM 6x86L PR200+ Top Side
IBM 6x86L PR200+
IBM26 6x86L-2VAP200GB
150 MHZ-2.8V CORE
IBM 6x86L PR200+ Back Side
COPYRIGHT USA
1995 CYRIX
IBM9314 R19034
88H3468 PQ
add comment
Core Frequency:150 MHz
Board Frequency:60 MHz
Clock Multiplier:2.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.35 µ
Core / I/O Voltage:2.8 / 3.3 V
Introduced:02/1996
L1 Cache:16 KB
CPU Code:M1R
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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