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Encyclopedia > AMD K5
K5 core diagram
K5 core diagram
AMD 5K86-P90 (SSA/5)
AMD 5K86-P90 (SSA/5)
AMD K5 PR166
AMD K5 PR166

The K5 was AMD's first in-house processor, developed to compete with Intel's Pentium microprocessor range. The chip was behind schedule when it was introduced in 1995. AMD as a company was in its infancy of microprocessor design, thus a lot of deadlines were missed and there was a lack of manufacturing expertise in scaling designs. The K5's design was ambitious, with the final product coming closer to a Pentium Pro than the Pentium "Classic". The K5 was based upon an internal highly parallel 29k RISC processor architecture with an x86 decoding front-end. Image File history File links Download high-resolution version (937x734, 18 KB) AMD K5 processor diagram. ... Image File history File links Download high-resolution version (937x734, 18 KB) AMD K5 processor diagram. ... Image File history File links Download high resolution version (738x738, 41 KB) Description: AMD 5k86-P90 SSA/5 Microprocessor Source: http://www. ... Image File history File links Download high resolution version (738x738, 41 KB) Description: AMD 5k86-P90 SSA/5 Microprocessor Source: http://www. ... Image File history File links Download high-resolution version (650x649, 93 KB) AMD K5 PR-166 microprocessor Source: my own CPU collection Other version: thats how the bottom side looks like File links The following pages on the English Wikipedia link to this file (pages on other projects are... Image File history File links Download high-resolution version (650x649, 93 KB) AMD K5 PR-166 microprocessor Source: my own CPU collection Other version: thats how the bottom side looks like File links The following pages on the English Wikipedia link to this file (pages on other projects are... Advanced Micro Devices, Inc. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... Pentium logo, with MMX enhancement The Pentium is a fifth-generation x86 architecture microprocessor from Intel. ... A microprocessor (sometimes abbreviated µP) is a programmable digital electronic component that incorporates the functions of a central processing unit (CPU) on a single semiconducting integrated circuit (IC). ... 1995 (MCMXCV) was a common year starting on Sunday of the Gregorian calendar. ... AMD 29000 Microprocessor The AMD 29000, often simply 29k, was a popular family of RISC-based 32-bit microprocessors and microcontrollers from Advanced Micro Devices. ... Reduced Instruction Set Computer (RISC), is a microprocessor CPU design philosophy that favors a smaller and simpler set of instructions that all take about the same amount of time to execute. ...


The K5 offered good x86 compatibility. All models had 4.3 million transistors, with five integer units that could process instructions out of order and one floating point unit. The branch target buffer was four times the size of the Pentium's and register renaming improved parallel performance of the pipelines. The chips speculative execution of instructions reduced pipeline stall. It touted an instruction cache of 16 KiB, which was double that of the Pentium. Further, the primary cache was a "4-way" set associative, instead of the Pentium's "2-way" set. Though, the K5 lacked MMX instructions, which Intel started offering in its Pentium MMX processors that were launched in early 1997. The K5's one floating point unit was lacking, as the Pentium offered two. Assorted transistors A transistor is a semiconductor device that uses a small amount of voltage or electrical current to control a larger change in voltage or current. ... MMX is a SIMD instruction set designed by Intel, introduced in 1997 in their Pentium MMX microprocessors. ...


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 had its issues. The low clock rates were due in part to AMD's infancy as a manufacturing company at the time. 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 projects 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. The Cyrix 6x86 is a sixth-generation, 32-bit 80x86-compatible microprocessor designed by Cyrix and manufactured by IBM and SGS-Thomson. ... AMD Am486 Microprocessor The Am486 was a 80486-class family of computer processors that were produced by AMD in the 1990s. ... History 1997 saw the arrival of AMDs K6 microprocessor. ...


There were two sets of K5 processors, internally called the SSA/5 and the 5k86, both released with the K5 label. The "SSA/5" line ran from 75 to 100 MHz (5K86 P75 to P100, later K5 PR-75 to PR100); the "5k86" line ran from 90 to 133 MHz. However, AMD used what it called a PR rating, or performance rating, to label the chips according to their equivalence to a Pentium of that clock speed. Thus, a 116 MHz chip from the second line was marketed as the "K5 PR166". Manufacturing delays caused the PR200's arrival to unfortunately nearly align with the release of K6. Since AMD did not want the two chips competing, the K5-PR200 only arrived in small numbers. Enthusiasts have speculated that many PR200 chips were sold as PR166, because of easy overclocking with later PR166 chips.[1] The PR rating system was developed by AMD in the mid-1990s as a method of comparing their x86 processors to those of rival Intel. ...


Models

SSA/5

  • Sold as 5K86 P75 to P100, later as K5 PR75 to PR100
  • 4.3 million Transistors in 500 or 350 nm
  • L1-Cache: 8 + 16 KiB (Data + Instructions)
  • Socket 5 and Socket 7
  • VCore: 3.52V
  • Front side bus: 50 (PR75), 60 (PR90), 66 MHz (PR100)
  • First release: March 27, 1996
  • Clockrate: 75, 90, 100 MHz

Socket 5 was created for the second generation of Intel Pentium processors operating at 75 MHz or higher. ... Socket 7 is a physical and electrical specification for the x86 processor socket matching the pins on Pentium microprocessors manufactured by Intel, and compatibles made by Cyrix, AMD and others. ... In computers, the front side bus (FSB) is a term for the physical bi-directional data bus that carries all electronic signal information between the central processing unit (CPU) and other devices within the system such as random access memory (RAM), the system BIOS, AGP video cards, PCI expansion cards... 1996 (MCMXCVI) was a leap year starting on Monday of the Gregorian calendar, and was designated the International Year for the Eradication of Poverty. ...

5k86

  • Sold as K5 PR120 to PR166 (PR200)
  • 4.3 million Transistors in 350 nm
  • L1-Cache: 8 + 16 KiB (Data + Instructions)
  • Socket 5 and Socket 7
  • VCore: 3.52V
  • Front side bus: 60 (PR120/150), 66 MHz
  • First release: October 7, 1996
  • Clockrate: 90 (PR120), 100 (PR133), 105 (PR150), 116.6 (PR166), 133 MHz (PR200)

Socket 5 was created for the second generation of Intel Pentium processors operating at 75 MHz or higher. ... Socket 7 is a physical and electrical specification for the x86 processor socket matching the pins on Pentium microprocessors manufactured by Intel, and compatibles made by Cyrix, AMD and others. ... In computers, the front side bus (FSB) is a term for the physical bi-directional data bus that carries all electronic signal information between the central processing unit (CPU) and other devices within the system such as random access memory (RAM), the system BIOS, AGP video cards, PCI expansion cards... 1996 (MCMXCVI) was a leap year starting on Monday of the Gregorian calendar, and was designated the International Year for the Eradication of Poverty. ...

References

  1. ^ AMD K5 PR 200?, Google Groups, August 18, 1998.

External links


  Results from FactBites:
 
AMD K5 microprocessor family (466 words)
AMD K5 was produced in speeds up to 200 MHz (200 MHz version was not officially announced by AMD).
Comparing AMD K5 family with Pentium CPU family you may notice that all AMD K5 microprocessors rated 120 MHz or higher were manufactured with integrated heatspreaders, while the fastest production Pentium microprocessor with integrated heatspreader was Pentium 100.
K5 200 MHz version was not officially announced by AMD, probably because this processor was released at about the same time as K6 processors.
AMD x86 (8086 - K5) identification (525 words)
To identify AMD K5 processor use the part number printed on the front of the CPU.
Newer K5 processors have part numbers starting from "AMD-K5", for their interpretation please see K5 section below.
Newer K5 processors have part numbers starting from "AMD-K5", for their interpretation please see the table below.
  More results at FactBites »

 
 

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