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The ST 5x86 Processor
The ST 5x86 is an ST made Cyrix 5x86 processor. The 5x86 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 ST/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
SGS-Thomson 5x86-100
SGS-Thomson 5x86-100 Top Side
5x86-100
ST5x86V10HS
HEATSINK RECOMMENDED
3.45 Volt
SGS-Thomson 5x86-100 Back Side
(c) (M) 1995 Cyrix USA
G5FB601E
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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 01/1996
L1 Cache:16 KB
Package Type:Ceramic
PGA-168
Socket: 3
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