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Cyrix 6x86
  Cyrix 6x86-P150+GP
  Cyrix 6x86-P150+GP, no Voltage Markings
  Cyrix 6x86-P150+GP w/ Capacitors
  Cyrix 6x86-P166+GP 3.53V
  Cyrix 6x86-P166+GP
  Cyrix 6x86-PR166+GP
  Cyrix 6x86L-P150+GP
  Cyrix 6x86L-PR166+GP
  Cyrix 6x86L-PR200+GP
  Cyrix 6x86L-PR200+GP, Variant
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The Cyrix 6x86 Processor
1995 marketing logo
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
Cyrix 6x86-P150+GP
Cyrix 6x86-P150+GP Top Side
6x86-P150+GP
120MHz
3.3V or 3.52V
Cyrix 6x86-P150+GP Back Side
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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
Voltage:3.45 V
Introduced:October 6, 1995
L1 Cache:16 KB
CPU Code:6x68
M1
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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Cyrix 6x86-P150+GP, no Voltage Markings
Cyrix 6x86-P150+GP, no Voltage Markings Top Side
6x86-P150+GP
120MHz
Cyrix 6x86-P150+GP, no Voltage Markings Back Side
(c) (m) 1995 Cyrix USA
G8L4606J
add comment
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
Voltage:3.3 V
Introduced:02/1996
Manufactured:week 06/1996
Made in:USA
L1 Cache:16 KB
CPU Code:6x68
M1
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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Cyrix 6x86-P150+GP w/ Capacitors
Cyrix 6x86-P150+GP w/ Capacitors Top Side
6x86-P150+GP
120MHz
3.3V or 3.52V
Cyrix 6x86-P150+GP w/ Capacitors Back Side
(C)(M) Cyrix USA
G8DC5624F
add comment
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
Voltage:3.45 V
Introduced:02/1996
Manufactured:week 24/1996
Made in:USA
L1 Cache:16 KB
CPU Code:6x68
M1
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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Cyrix 6x86-P166+GP 3.53V
Cyrix 6x86-P166+GP 3.53V Top Side
6x86-P166+GP
133MHz
3.52V (028)
Cyrix 6x86-P166+GP 3.53V Back Side
(C)(M)1995 Cyrix USA
G8DA5629C
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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
Voltage:3.45 V
Introduced:02/1996
Made in:USA
L1 Cache:16 KB
CPU Code:6x68
M1
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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Cyrix 6x86-P166+GP
Cyrix 6x86-P166+GP Top Side
6x86-P166+GP
133MHz
3.3V or 3.52V
Cyrix 6x86-P166+GP Back Side
(C)(M)1995 Cyrix USA
G9DEA651H
add comment
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
Voltage:3.45 V
Introduced:02/1996
Manufactured:week 51/1996
Made in:USA
L1 Cache:16 KB
CPU Code:6x68
M1
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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Cyrix 6x86-PR166+GP
Cyrix 6x86-PR166+GP Top Side
6x86-PR166+GP
133MHz
3.3V or 3.52V
Cyrix 6x86-PR166+GP Back Side
(C)(M)1995 Cyrix USA
G9LNA709B
add comment
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
Voltage:3.45 V
Introduced:02/1996
Manufactured:week 09/1997
Made in:USA
L1 Cache:16 KB
CPU Code:6x68
M1
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).
Cyrix 6x86L-P150+GP
Cyrix 6x86L-P150+GP Top Side
6x86L-P150+GP
120MHz
2.8V
Cyrix 6x86L-P150+GP Back Side
COPYRIGHT USA
1995 CYRIX
GAKJ3650A
MADE IN
CANADA
add comment
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
Core / I/O Voltage:2.8 / 3.3 V
Introduced:02/1996
Manufactured:week 50/1996
Made in:Canada
L1 Cache:16 KB
CPU Code:6x68
M1
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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Cyrix 6x86L-PR166+GP
Cyrix 6x86L-PR166+GP Top Side
6x86L-PR166+GP
133MHz
3.3V
FAN/HEATSINK REQUIRED
Cyrix 6x86L-PR166+GP Back Side
(C)(M)1995 Cyrix USA
GADJ3707B
add comment
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
Core / I/O Voltage:2.8 / 3.3 V
Introduced:02/1996
Manufactured:week 07/1997
Made in:USA
L1 Cache:16 KB
CPU Code:6x68
M1
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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Cyrix 6x86L-PR200+GP
Cyrix 6x86L-PR200+GP Top Side
6x86L-PR200+GP
150MHz
3.3V
FAN/HEATSINK REQUIRED
Cyrix 6x86L-PR200+GP Back Side
(C)(M)1995 Cyrix USA
GADJ3701M
The 6x86 PR200 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.
 
Comment by VMUNIX (andres_leitner[at]yahoo.com.ar):
For a while, the most powerfull x86 processor.
 
Comment by morkork:
Yes, in April 1996 a Cyrix press release announced "Cyrix Introduces the World's Fastest Windows 95 PCs"
 
add comment
Core Frequency:150 MHz
Board Frequency:75 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.35
Core / I/O Voltage:2.8 / 3.3 V
Introduced:June 3, 1996
Manufactured:week 01/1997
Made in:USA
L1 Cache:16 KB
CPU Code:6x68L
M1L
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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Cyrix 6x86L-PR200+GP, Variant
Cyrix 6x86L-PR200+GP, Variant Top Side
6x86L-PR200+GP
150MHz
Core: 2.8V I/O: 3.3V
Fan/Heatsink Required
Cyrix 6x86L-PR200+GP, Variant Back Side
COPYRIGHT USA
1995 CYRIX
GAKQ3715S
MADE IN
CANADA
add comment
Core Frequency:150 MHz
Board Frequency:75 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:3,000,000
Circuit Size:0.35
Core / I/O Voltage:2.8 / 3.3 V
Introduced:June 3, 1996
Manufactured:week 10/1997
Made in:Canada
L1 Cache:16 KB
CPU Code:6x68L
M1L
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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