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AMD K5
  AMD-K5-PR75ABR
  AMD-K5-PR75ABR Goldcap
  AMD-K5-PR90ABQ
  AMD-K5-PR100ABQ
  AMD-K5-PR100ABR
  AMD-K5-PR100ABQ Goldcap
  AMD-K5-PR120ABQ
  AMD-K5-PR120ABR
  AMD-K5-PR133ABQ
  AMD-K5-PR133ABR
  AMD-K5-PR150ABR
  AMD-K5-PR166ABR
  AMD-K5-PR200ABX
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The AMD K5 Processor
The K5 was developed by AMD to compete with Intel's Pentium microprocessor range. Introduced in 1996 almost 2 years late, AMD's problems were compounded by being unable to manufacture the chip at the clock speeds originally projected. In its favor, the K5 did at least offer good x86 compatibility. All models had 4.3 million transistors on-chip. No K5 supported MMX instructions. Internally ambitious, it was closer to a Pentium Pro than a Pentium, based upon an internal highly parallel RISC processor architecture with an x86 decoding front-end.
 
Improvements and differences to the Intel Pentium include:
  • Five integer units, which could process instructions out of order, one floating point unit, compared to two units of the Pentium
  • The branch target buffer was four times the size of the Pentium's, although not reportedly more accurate
  • Register renaming improved parallel performance of the pipelines
  • Speculative execution of instructions reduced pipeline stall
  • The instruction cache is 16 Kb, double the Pentium
  • The primary cache is 4-way set associative instead of the Pentium's 2-way
The K5 project represented an early chance for AMD to take technical leadership from Intel. Although the chip addressed the right design concepts, the actual engineering implementation was weak. The low clock rates were due in part to AMD's deficiencies as a manufacturing company in the period. However, having a branch prediction unit four times the size of the Pentium, yet reportedly not delivering superior performance, is an example of how the actual implementation fell short of the project goals. Additionally, while the K5's floating point performance was better than that of the Cyrix 6x86, it was weaker than that of the Pentium. Because it was late to market and did not meet performance expectations, the K5 never gained the acceptance among large computer manufacturers that the Am486 and AMD K6 enjoyed. Overall, the chip failed to deliver, both in terms of raw performance, and financially for AMD.

References:  AMD K5 Tech Docs  AMD-K5 Processor Overview  Byte.com: Next generation: K5  PC Guide  Processor Emporum
AMD-K5-PR75ABR
AMD-K5-PR75ABR Top Side
AMD-K5-PR75ABR
75MHz
E 9621DPI
(m)(c) 1996 AMD
HEATSINK AND FAN
MALAYSIA
Win95 Logo
AMD-K5-PR75ABR Back Side
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Core Frequency:75 MHz
Board Frequency:50 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:03/1996
Manufactured:week 21/1996
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 SSA5
Package Type:Ceramic
PGA-296
Socket: 5/7
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AMD-K5-PR75ABR Goldcap
AMD-K5-PR75ABR Goldcap Top Side
AMD-K5-PR75ABR
75MHz
E 9637MPM
(m)(c) 1996 AMD
HEATSINK AND FAN
MALAYSIA
Win95 Logo
AMD-K5-PR75ABR Goldcap Back Side
The standard ceramic PGA package versions of the 75 MHz K5 suffered from heat troubles and where therefore enhanced with a heat spreader, a flat metal plate designed to distribute heat evenly across the processor surface.
 
add comment
Core Frequency:75 MHz
Board Frequency:50 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:03/1996
Manufactured:week 37/1996
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 SSA5
Package Type:Ceramic
PGA-296
Goldcap
Socket: 5/7
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AMD-K5-PR90ABQ
AMD-K5-PR90ABQ Top Side
AMD-K5
PR90
AMD-K5-PR90ABQ
90MHz
E 9623FPE
(m) (c) 1996 AMD
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR90ABQ Back Side
add comment
Core Frequency:90 MHz
Board Frequency:60 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 26/1996
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 SSA5
Package Type:Ceramic
PGA-296
Socket: 5/7
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AMD-K5-PR100ABQ
AMD-K5-PR100ABQ Top Side
AMD-K5
PR100
AMD-K5-PR100ABQ
100MHz
F 9636API
(m) (c) 1996 AMD
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR100ABQ Back Side
Donated by Christian Lederer. Thanks a lot!  
add comment
Core Frequency:100 MHz
Board Frequency:66 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 36/1996
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 SSA5
Package Type:Ceramic
PGA-296
Socket: 5/7
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AMD-K5-PR100ABR
AMD-K5-PR100ABR Top Side
AMD-K5
PR100
AMD-K5-PR100ABR
100MHz
F 9704FPD
(m) (c) 1996 AMD
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR100ABR Back Side
add comment
Core Frequency:100 MHz
Board Frequency:66 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 04/1997
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 SSA5
Package Type:Ceramic
PGA-296
Socket: 5/7
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AMD-K5-PR100ABQ Goldcap
AMD-K5-PR100ABQ Goldcap Top Side
AMD-K5
PR100
AMD-K5-PR100ABQ
100MHz
F 9636GPF
(m) (c) 1996 AMD
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR100ABQ Goldcap Back Side
The standard ceramic PGA package versions of the 100 MHz K5 suffered from heat troubles and where therefore enhanced with a heat spreader, a flat metal plate designed to distribute heat evenly across the processor surface.
 
add comment
Core Frequency:100 MHz
Board Frequency:66 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 39/1996
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 SSA5
Package Type:Ceramic
Goldcap
PGA-296
Socket: 5/7
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AMD-K5-PR120ABQ
AMD-K5-PR120ABQ Top Side
AMD-K5-PR120ABQ
B 9644BPD
(m) (c) 1996 AMD
60MHz Bus 3.52V
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR120ABQ Back Side
With the K5 PR120 AMD changed the naming scheme to match an equivalent Pentium's clock speed, so the K5 PR100 was the last K5 to show its clock rate in the PR rating.
 
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Core Frequency:90 MHz
Board Frequency:60 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 44/1996
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 5k86
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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AMD-K5-PR120ABR
AMD-K5-PR120ABR Top Side
AMD-K5-PR120ABR
B 9645BPG
(m) (c) 1996 AMD
60MHz Bus 3.52V
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR120ABR Back Side
add comment
Core Frequency:90 MHz
Board Frequency:60 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 45/1996
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 5k86
Package Type:Ceramic
PGA-296
Goldcap
Socket: 5/7
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AMD-K5-PR133ABQ
AMD-K5-PR133ABQ Top Side
AMD-K5-PR133ABQ
B 9644GPE
(m) (c) 1996 AMD
66MHz Bus 3.52V
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR133ABQ Back Side
add comment
Core Frequency:100 MHz
Board Frequency:66 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 44/1996
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 5k86
Package Type:Ceramic
PGA-296
Goldcap
Socket: 5/7
top of page
AMD-K5-PR133ABR
AMD-K5-PR133ABR Top Side
AMD-K5-PR133ABR
B 9730BPC
(m) (c) 1996 AMD
66MHz Bus 3.52V
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR133ABR Back Side
add comment
Core Frequency:100 MHz
Board Frequency:66 MHz
Clock Multiplier:1.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 30/1997
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 5k86
Package Type:Ceramic
PGA-296
Goldcap
Socket: 5/7
top of page
AMD-K5-PR150ABR
AMD-K5-PR150ABR Top Side
AMD-K5-PR150ABR
B 9647CPF
(m) (c) 1996 AMD
66MHz Bus 3.52V
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR150ABR Back Side
add comment
Core Frequency:105 MHz
Board Frequency:66 MHz
Clock Multiplier:1.6
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 47/1996
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 5k86
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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AMD-K5-PR166ABR
AMD-K5-PR166ABR Top Side
AMD-K5-PR166ABR
C 9727CPD
(m) (c) 1996 AMD
66MHz Bus 3.52V
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR166ABR Back Side
add comment
Core Frequency:116 MHz
Board Frequency:66 MHz
Clock Multiplier:1.8
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 27/1997
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 5k86
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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AMD-K5-PR200ABX
AMD-K5-PR200ABX Top Side
AMD-K5-PR200ABX
C 9713DPA
(m) (c) 1996 AMD
66MHz Bus 3.52V
HEATSINK AND FAN
Win95 Logo
AMD-K5-PR200ABX Back Side
Officially the K5 line of processors went up to a 116MHz version (PR166) and was discontinued when the K6 was released in April 1997. However, there are some K5 PR200 around, probably as sample chips for mainboard manufacturers or for testing purposes. The K5 PR200 never has been officially released and is not mentioned in AMDs technical documentation (the fastest K5 in the Data Sheets is an AMD-K5-PR166ABX).
 
Comment by Paul Christian Claudio (pcclaudio[at]gmail.com):
Though k5-200 was not officially released by AMD, it was widely sold here in the Philippines (though not that long, shorter than Barton based Durons, even shorter than K6-III). Some cash-strapped PC enthusiasts got hold of these chips, while they are waiting for another cycle of their hard-earned cash to get hold of an upgrade for their brand-new, upgrade-friendly socket 7 mobos. It could have been that it was not released there in the us because amd would have rather spend their marketing resources in promoting their then, just-out k6 processor. K5-200 and K6 went out almost the same time.
 
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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:4,300,000
Circuit Size:0.35
Voltage:3.52 V
Introduced:10/1996
Manufactured:week 13/1997
Made in:Malaysia
L1 Cache:16+8 KB
CPU Code:K5 5k86
Package Type:Ceramic
PGA-296
Goldcap
Socket: 7
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