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IBM 6x86MX
  IBM 6x86MX PR166, 66 MHz Bus
  IBM 6x86MX PR200, 66 MHz Bus
  IBM 6x86MX PR233, 75 MHz Bus
  IBM 6x86MX PR300, 75 MHz Bus
  IBM 6x86MX PR300, 66 MHz Bus, black
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The IBM/Cyrix 6x86MX Processor
The IBM 6x86MX is in fact an IBM manufactured and labelled Cyrix 6x86MX.
The successor to the 6x86 and 6x86L is the 6x86MX (M2), intended to compete with AMD's K6 and Intel's Pentium MMX. The 6x86MX is an evolutionary step from the 6x86 and is very similar to it in internal function. The 6x86MX supports the MMX extension and also features several other improvements over the original 6x86 chip. The internal cache was increased from 16 to 64 KB, a 256 byte additional pre-cache was added to help improve efficiency in how the regular level 1 cache is operated, the Branch Prediction was improved and the internals of the chip have been optimized for 32-bit operation.
 
References:  Cyrix 6x86 Processor FAQ  Cyrix Press Releases  Cyrix 6x86MX Press Tour
IBM 6x86MX PR166, 66 MHz Bus
IBM 6x86MX PR166, 66 MHz Bus Top Side
6x86MX PR166
IBM26x86MX-AVAPR166GB
2.0x 66MHZ-2.9V CORE
IBM 6x86MX PR166, 66 MHz Bus Back Side
COPR. CYRIX
1995,96,97 USA
IBM9314 R50019
01L4880 PQ
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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:6,500,000
Circuit Size:0.35
Core / I/O Voltage:2.9 / 3.3 V
Introduced:05/1997
L1 Cache:64 KB
CPU Code:M2
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86MX PR200, 66 MHz Bus
IBM 6x86MX PR200, 66 MHz Bus Top Side
6x86MX PR200
IBM26x86MX-BVAPR200GC
2.5x 66MHZ-2.9V CORE
IBM 6x86MX PR200, 66 MHz Bus Back Side
COPR. CYRIX
1995,96,97 USA
IBM9314 T07079
20L7646 PQ
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Core Frequency:166 MHz
Board Frequency:66 MHz
Clock Multiplier:2.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:6,500,000
Circuit Size:0.35
Core / I/O Voltage:2.9 / 3.3 V
L1 Cache:64 KB
CPU Code:M2
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86MX PR233, 75 MHz Bus
IBM 6x86MX PR233, 75 MHz Bus Top Side
6x86MX PR233
IBM26x86MX-BVAPR233GF
2.5x 75MHZ-2.9V CORE
IBM 6x86MX PR233, 75 MHz Bus Back Side
COPR. CYRIX
1995-1998 USA
IBM9314 T31057
21L0374 PQ
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Core Frequency:188 MHz
Board Frequency:75 MHz
Clock Multiplier:2.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:6,500,000
Circuit Size:0.35
Core / I/O Voltage:2.9 / 3.3 V
L1 Cache:64 KB
CPU Code:M2
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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IBM 6x86MX PR300, 75 MHz Bus
IBM 6x86MX PR300, 75 MHz Bus Top Side
6x86MX PR300
IBM26x86MX-CVAPR300GF
3.0x 75MHZ-2.9V CORE
IBM 6x86MX PR300, 75 MHz Bus Back Side
COPR. CYRIX
1995,96,97 USA
IBM9314 T18507
21L0374 PQ
add comment
Core Frequency:225 MHz
Board Frequency:75 MHz
Clock Multiplier:3.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:6,500,000
Circuit Size:0.35
Core / I/O Voltage:2.9 / 3.3 V
L1 Cache:64 KB
CPU Code:M2
Package Type:Ceramic
PGA-296
Heat Spreader
Socket: 7
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IBM 6x86MX PR300, 66 MHz Bus, black
IBM 6x86MX PR300, 66 MHz Bus, black Top Side
6x86MX PR300
IBM26x86MX-DVAPR300HF
3.5x 66MHZ-2.9V CORE
T28103 29L3737 PQ
IBM 6x86MX PR300, 66 MHz Bus, black Back Side
COPR. CYRIX
1995-1998 USA
add comment
Core Frequency:233 MHz
Board Frequency:66 MHz
Clock Multiplier:3.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:6,500,000
Circuit Size:0.35
Core / I/O Voltage:2.9 / 3.3 V
L1 Cache:64 KB
CPU Code:M2
Package Type:Ceramic
PGA-296
Heat Spreader
Socket: 7
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