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Encyclopedia > AMD 5x86
AMD 5x86-P75
AMD 5x86-P75

The AMD 5x86 processor is an x86-compatible CPU introduced in 1995 by AMD for use in 486-class computer systems. It was one of the fastest, and most universally-compatible upgrade paths for users of 486 systems. AMD 5x86-P75 File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... AMD 5x86-P75 File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... x86 or 80x86 is the generic name of a microprocessor architecture first developed and manufactured by Intel. ... This CPU uses numerous pins to connect to the motherboard. ... 1995 was a common year starting on Sunday of the Gregorian calendar. ... Advanced Micro Devices, Inc. ... Intel i486 DX2- top view The Intel i486 (also called 486 or 80486) is a range of Intel CISC microprocessors which is part of the Intel x86 family of processors. ... A computer is a device or machine for making calculations or controlling operations that are expressible in numerical or logical terms. ...


Introduced in November 1995, the AMD 5x86 (also known as 5x86-133, Am5x86, X5-133, and sold under various 3rd-party labels such as "Turbochip") is a standard 486 processor with an internally-set multiplier of 4, allowing it to run at 133 MHz on systems without official support for clock-multiplied DX2 or DX4 486 processors. Like most of the later 486 parts, the 5x86 featured write-back L1 cache, and unlike all but a few, a generous 16 kilobytes rather than the more common 8KB. A rare 150 MHz-rated part may have also been released by AMD. 1995 was a common year starting on Sunday of the Gregorian calendar. ... In synchronous digital electronics, such as most computers, a clock signal is a signal used to coordinate the actions of two or more circuits. ... A megahertz (MHz) is one million (106) hertz, a measure of frequency. ... The Intel 80486DX2 is a CPU produced by Intel that was introduced in 1992. ... The Intel DX4 is a clock-tripled 80486 microprocessor chip. ... Diagram of a CPU memory cache A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. ... Diagram of a CPU memory cache A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. ... A kilobyte (derived from the SI prefix kilo-) is a unit of information or computer storage equal to either 1024 or 1000 bytes. ...


Since having a clock multiplier of four was not part of the original Socket 3 design, AMD made the 5x86 look for a two times setting from the motherboard and interpret that as four times instead. In other words, to use the 5x86 you want to set the motherboard to the 2x setting. This will actually cause the 5x86 to run at 4x. The chip will actually physically fit into an older 486 socket such as a socket 1 or 2 or the original 168-pin 486 socket, but doing this requires a voltage regulator since the AMD chip runs at 3.3 volts.


The combination of best-in-class clock speed and the write-back cache allowed the 5x86 to equal or slightly surpass an Intel Pentium 75 MHz processor in business application performance. Also, because it was based on a pure 486 design, it was compatible with older systems, something its slightly faster rival, the Cyrix Cx5x86, had trouble with. The CPU was commonly overclocked to 160 MHz, thereby giving performance similar to that of a Pentium 100 system. Although it has been reported that individuals have successfully run the chip at 200 MHz, this would seldom have been achievable due to the rarity of video cards that could cope with a 50 MHz system bus on a VESA system. Intel Corporation (NASDAQ: INTC) (founded 1968) is a U.S.-based multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... Pentium logo, w/ MMX enhancement The Pentium is a fifth-generation x86 architecture microprocessor by Intel which first shipped on March 22, 1993. ... Released in August 1995, four months before the more famous Cyrix 6x86, the Cyrix Cx5x86 was the fastest CPU ever produced for Socket 3 computer systems. ... A GeForce 4 4200-based graphics card A graphics card or video card is a component of a computer which is designed to convert a logical representation of an image stored in memory to a signal that can be used as input for a display medium, most often a monitor... Front Side Bus (FSB) is the term used to describe the CPU data bus. ... The VESA Local Bus (usually shortened to VLB) is a local bus defined by the Video Electronics Standards Association, mostly used in personal computers based on the Intel 80486 CPU. VESA Local Bus worked alongside the ISA bus; it acted as a high-speed conduit for memory-mapped I/O...


The 5x86 is also notable for the first-ever use of the controversial PR rating. Because the 5x86 was the equal of a Pentium 75 MHz processor in benchmarks, AMD later marketed the chip as "AM5x86-P75". 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. ...


Sales of the Am5x86 were an important source of revenue for AMD at a time when lengthy delays in bringing the AMD K5 to production were threatening the company's profitability. AMD K5 (5k86 / SSA/5) Microprocessor The K5 was developed by AMD to compete with Intels Pentium microprocessor range. ...


AMD manufactured the 5x86 processor for ordinary PC systems until 1999. It was popular for entry-level desktop systems, appeared in many different notebook models, and also sold separately as an upgrade processor for older 486 systems. Several companies made upgrade kits which packaged an AMD 5x86 with a voltage regulator and socket converter, which allowed its use on almost any 486 motherboard ever produced. 1999 is a common year starting on Friday of the Common Era, and was designated the International Year of Older Persons by the United Nations. ...


The chip remains in production today, and is a popular choice for use in embedded controllers. One such example is the Élan SC520 family of microcontrollers marketed by AMD.


External links



List of AMD microprocessors | List of AMD CPU slots, sockets

Am2900 | Am29000 | Am286 | Am386 | Am486 | Am5x86 | K5 | K6 | K6-2 | K6-III | Duron | Sempron | Athlon | Athlon 64 | Athlon 64 FX | Athlon 64 X2 | Turion 64 | Opteron   (note: italics indicate non-x86-architecture processors) AMD logo, claiming fair use This is a copyrighted and/or trademarked logo. ... This article gives is a list of Advanced Micro Devices (AMD)-made microprocessors (µPs), sorted by generation and release year. ... Here is a list of sockets and slots used by AMD central processing units: Am486: Same as Intel. ... The AMD 29000, often simply 29k, was a popular family of RISC-based 32-bit microprocessors and microcontrollers from Advanced Micro Devices. ... AMD started in the x86 business as a second-source manufacturer for Intels chip designs. ... AMD Am386DX-40 CPU The Am386 central processing unit microprocessor was released by AMD in 1991. ... The Am486 was a 80486-class family of computer processors that were produced by AMD in the 1990s. ... AMD K5 (5k86 / SSA/5) Microprocessor The K5 was developed by AMD to compete with Intels Pentium microprocessor range. ... History 1997 saw the arrival of AMDs K6 microprocessor. ... The K6-2 was a x86 microprocessor manufactured by AMD, available in speeds ranging from 266 to 550 MHz. ... The K6-III was an x86 microprocessor manufactured by AMD, the last and fastest of all Socket 7 processors. ... The AMD Duron is an x86-compatible computer processor manufactured by AMD. It was released in the summer of 2000 as a low-cost alternative to AMDs own Athlon processor and the Pentium III and Celeron processor lines from rival Intel. ... Sempron 3000+ Sempron is AMDs newest low-end CPU. It is replacing the Duron processor, and will compete against Intels Celeron D processor. ... Athlon is the brand name applied to a series of different x86 processors designed and manufactured by AMD. The original Athlon, or Athlon Classic, was the first seventh-generation x86 processor and, in a first, retained the initial performance lead it had over Intels competing processors for a significant... The Athlon 64 (codenamed ClawHammer, Newcastle, Winchester, Venice, and San Diego) represents AMDs entry into the consumer 64-bit microprocessor market, released on September 23rd, 2003. ... The Athlon 64 FX is an AMD K8 series processor targeted at enthusiasts. ... The Athlon 64 X2 is the first dual-core desktop CPU manufactured by AMD. It is essentially a processor consisting of two Athlon 64 cores joined together on one die with some additional control logic. ... Turion 64 is AMDs 64-bit mobile processor, intended to compete with Intels Pentium M. It is compatible with AMDs Socket 754 and is equipped with 512 or 1024 KB of L2 cache, a 64-bit single channel on-die memory controller, and an 800MHz HyperTransport bus. ... The AMD Opteron is the first eighth-generation x86 processor (K8 core), and the first of AMDs AMD64 (x86-64) processors, released April 22, 2003. ... x86 or 80x86 is the generic name of a microprocessor architecture first developed and manufactured by Intel. ...


  Results from FactBites:
 
Cyrix 5x86 family (133 words)
Cyrix 5x86 (M1sc) is a 32-bit microprocessor compatible with Intel 80486.
Produced in the same package as the 80486, the 5x86 included many features from M1 (Cyrix 6x86) architecture - 64-bit internal architecture, branch prediction, data forwarding and 16 KB write-back cache.
Unlike the 5th generation x86 processors, the Cyrix 5x86 was not a superscalar processor, but it could execute integer and floating point instructions in parallel.
AMD 5x86 - Wikipedia, the free encyclopedia (551 words)
The AMD 5x86 processor is an x86-compatible CPU introduced in 1995 by AMD for use in 486-class computer systems.
Introduced in November 1995, the AMD 5x86 (also known as 5x86-133, Am5x86, X5-133, and sold under various 3rd-party labels such as "Turbochip") is a standard 486 processor with an internally-set multiplier of 4, allowing it to run at 133 MHz on systems without official support for clock-multiplied DX2 or DX4 486 processors.
The 5x86 is also notable for the first-ever use of the controversial PR rating.
  More results at FactBites »

 
 

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