Cyrix 6x86 family

Cyrix 6x86 processor is a x86 compatible superscalar microprocessor with 64-bit internal architecture, 80-bit Floating Point Unit, 16 KB write-back cache, speculative execution, branch prediction and other advanced features.

There were three different versions of the 6x86 CPU:

  • 6x86 - Original single-voltage version.
  • 6X86L - Low-power version of 6x86 CPU with split core and I/O voltage.
  • 6x86MX - 6x86 microprocessor with advanced MMX instruction set, split core and I/O voltage and larger level 1 cache.

All Cyrix 6x86 processors used Pentium Rating (PR).

Die pictures:
 Manufacturers 
Cyrix 6x86MX-PR266 (83MHz 2.9V)

Picture of: Cyrix 6x86MX-PR266 (83MHz 2.9V)

207 MHz (266 MHz rating, 83 MHz bus)
296-pin staggered ceramic PGA

Engineering sample
IBM 6x86MX-DVAPR300HF (66 MHz 2.9V FCPGA)

Picture of: IBM 6x86MX-DVAPR300HF (66 MHz 2.9V FCPGA)

233 MHz (300 MHz rating, 66 MHz bus)
296-pin flip-chip staggered ceramic PGA
ST ST6x86P166+ / ST6x86P166+HS

Picture of: ST ST6x86P166+ / ST6x86P166+HS

133 MHz (166 MHz rating)
296-pin staggered ceramic PGA
 Modifications 
Cyrix 6x86L-P166+GP / 6x86L-PR166+GP

Picture of: Cyrix 6x86L-P166+GP / 6x86L-PR166+GP

133 MHz (166 MHz rating)
296-pin staggered ceramic PGA
IBM 6x86MX-CVAPR300GF (75 MHz 2.9V)

Picture of: IBM 6x86MX-CVAPR300GF (75 MHz 2.9V)

225 MHz (300 MHz rating, 75 MHz bus)
296-pin staggered ceramic PGA
ST ST6x86P150+ / ST6x86P150+HS

Picture of: ST ST6x86P150+ / ST6x86P150+HS

120 MHz (150 MHz rating)
296-pin staggered ceramic PGA
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At a glance

Type:
32-bit microprocessor
Technology (micron):
0.35
Frequency (MHz):
80 - 225