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Cyrix 586
  Cyrix 5x86-100GP w/ Cooler
  Cyrix 5x86-100GP (026-3.6V)
  Cyrix 5x86-100GP (030-3.45V)
  Cyrix 5x86-100QP
  Cyrix 5x86-120GP
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The Cyrix 5x86 Processor
The 5x86 processor utilizes efficient fifth-generation (Pentium class) architectural features to significantly improve performance while minimizing transistor count. It achieves this performance using a superpipelined architecture in the integer unit combined with data forwarding, branch prediction, a 16-KByte unified write-back cache, single-cycle instruction decode, and single-cycle execution.
 
The processor's built-in power-saving features automatically power down the Floating Point Unit (FPU) and other idle internal circuits, while the System Management Mode (SMM) conserves power flowing to system peripherals.
 
The Cyrix 5x86 processor is an example of Cyrix's strategy to design next-generation processor architectures that leverage existing designs. It is available in a 168-pin PGA or a 208-pin QFP package with standard 486 pinout. Though it's installed in a P24D socket on a 486 motherboard, the motherboard must have a BIOS that will support the 5x86.
 
References:  Cyrix 5x86 Processor Brief  Cyrix 5x86 Processor FAQs
Cyrix 5x86-100GP w/ Cooler
Cyrix 5x86-100GP w/ Cooler Top Side
5x86-100GP
Cyrix 5x86-100GP w/ Cooler Back Side
(c) (M) 1995 Cyrix USA
G5F8543J
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Core Frequency:100 MHz
Board Frequency:33 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:2,000,000
Circuit Size:0.65
Voltage:3.45 V
Introduced:08/1995
Manufactured:week 43/1995
L1 Cache:16 KB
CPU Code:5x86
M9
Package Type:Ceramic
PGA-168
Cooler
Socket: 3
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Cyrix 5x86-100GP (026-3.6V)
Cyrix 5x86-100GP (026-3.6V) Top Side
5x86-100GP
026-3.6V
COOLING FAN REQUIRED
Cyrix 5x86-100GP (026-3.6V) Back Side
(c) (M) 1995 CYRIX USA
G5F8543A
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Core Frequency:100 MHz
Board Frequency:33 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:2,000,000
Circuit Size:0.65
Voltage:3.6 V
Introduced:08/1995
Manufactured:week 43/1995
L1 Cache:16 KB
CPU Code:5x86
M9
Package Type:Ceramic
PGA-168
Socket: 3
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Cyrix 5x86-100GP (030-3.45V)
Cyrix 5x86-100GP (030-3.45V) Top Side
5x86-100GP
030-3.45V
Cyrix 5x86-100GP (030-3.45V) Back Side
(c) (M) 1995 Cyrix USA
G5L8544J
Donated by Christian Lederer. Thanks a lot!  
Comment by Paul Collins (pi314aussie[at]yahoo.com):
I run five computers with this chip to this day. Comment: -please note, there is also a genuine -120 chip as well. I bought one at the time. It runs well at its rated 120MHz, but can't be overclocked. I have been able to overclock the 100 chips to run at 120, except for one only. It only runs at its rated 100.
As an extra comment, I have been able to overclock the Intel A80486-50 to 60MHz, and it runs fine. I tried at 66MHz, but only get a jiffy of life before no-go. I don't know whether the CPU or the M/Board chipset chips are the problem. I say this because the chipset chips are only 50MHz chips too. This is still inconclusive, because I have only ever tried one Intel -50 chip, and one m/board. Perhaps I should get hold of more Intel chips, and try them into multiple of my 486 m/boards?
 
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Core Frequency:100 MHz
Board Frequency:33 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:2,000,000
Circuit Size:0.65
Voltage:3.45 V
Introduced:08/1995
Manufactured:week 44/1995
L1 Cache:16 KB
CPU Code:5x86
M9
Package Type:Ceramic
PGA-168
Socket: 3
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Cyrix 5x86-100QP
Cyrix 5x86-100QP Top Side
5x86-100QP
G5A8544C
Cyrix 5x86-100QP Back Side
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Core Frequency:100 MHz
Board Frequency:33 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:2,000,000
Circuit Size:0.65
Voltage:3.45 V
Introduced:08/1995
Manufactured:week 44/1995
L1 Cache:16 KB
CPU Code:5x86
M9
Package Type:Plastic
PGA-168
Socket: 3
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Cyrix 5x86-120GP
Cyrix 5x86-120GP Top Side
5x86-120GP
026-3.6V
COOLING FAN REQUIRED
Cyrix 5x86-120GP Back Side
(C)(M) 1995 Cyrix USA
G5D9543B
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Core Frequency:120 MHz
Board Frequency:40 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:2,000,000
Circuit Size:0.65
Voltage:3.45 V
Introduced:08/1995
Manufactured:week 44/1995
Made in:USA
L1 Cache:16 KB
CPU Code:5x86
M9
Package Type:Ceramic
PGA-168
Socket: 3
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