6x86L > Cyrix6x86L-PR166GP
Modified: May 27, 2005, 7:00 pm
Data Code:9704
Transistors:3 Million
Package:296 CPGA w/ Integrated Heatspreader
Process:0.35 Micron
Architecture:32 bit CISC (RISC influenced)
Used in:Computers
Description: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 extensively RISC influenced with
such design features as register renaming,
out-of-oreder execution and the like. The Cyrix
6x86 was a faster and better design then the Intel
Pentium. Its only weakness was its FPU which
was on the slow side.

Generic Details: CISC, In-/Out-of-order and
Dual Pipelined Execution
Pipeline Depth: 1 (Shared) plus
2x 4+2 In-/Out-of-order (Dual Pipeline) Stages,
4x FP plus 4x FP Store Queue
Instruction Decoder: 2x IA-32/Cycle
Execution Units: 2x Integer, Non-pipelined FPU
Execution Speed: Up to 2x IA-32/Cycle
The Cyrix design was used by:
ST Micro
National Semiconductor
Actual Speed: 133
Bus Speed: 66
Multiplier: 2
Fab'd By: IBM
The 'L' version is a low voltage
part with lower power requirements.