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General information | |
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Launched | November 1995 |
Discontinued | 1999 |
Marketed by | AMD |
Designed by | AMD |
Common manufacturer |
|
Performance | |
Max. CPU clock rate | 133 MHz to 160 MHz |
FSB speeds | 33 MHz to 50 MHz |
Cache | |
L1 cache | 4-way associative 16 KiB unified code and data, write-back or write-through. |
L2 cache | Motherboard dependent |
L3 cache | none |
Architecture and classification | |
Technology node | 0.35 μm |
Instruction set | x86 (IA-32) |
Physical specifications | |
Cores |
|
Packages | |
Sockets | |
History | |
Predecessor | Am486 |
Successor | AMD K5 |
The Am5x86 processor is an x86-compatible CPU announced in November of 1995 by AMD for use in 486-class computer systems. [1] It began shipping in December of 1995, with a base price of $93 per unit in bulk quantities. [2] Before being released, it was in development under the codename "X5". [3]
The Am5x86 (also known as the 5x86-133, Am5x86, X5-133, and sold under various 3rd-party labels such as the Kingston Technology "Turbochip" [4] ) is an Enhanced Am486 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 all Enhanced Am486, the Am5x86 featured write-back L1 cache, and unlike all but a few, a generous 16 kilobytes rather than the more common 8 KB. [2] A rare 150 MHz-rated OEM part was also released by AMD.
Since having a clock multiplier of four is not part of the original Socket 3 design (and that the 486 only have a single CLKMUL pin anyway), AMD made the 5x86 accept a 2x setting from the motherboard and instead operate at a rate of 4x. [5] When using an Am5x86, the motherboard must be set to the 2x setting. The chip will actually physically fit into an older 486 socket such as a socket 1 or 2 or the original 168-pin 80486 socket, but doing this requires a replacement voltage regulator, since the AMD chip runs at 3.45 volts.
The combination of clock speed and the relatively large 16 KB write-back L1 cache allows the 5x86 to equal or slightly exceed an Intel Pentium 75 MHz processor in integer arithmetic in benchmarks. [6] Real world performance varies, however, with later Windows operating systems and many FPU-sensitive games favoring the Pentium 75 MHz. Because it is based on a pure 486 design, it is compatible with older systems, something its slightly faster rival, the Cyrix Cx5x86, has trouble with. The CPU is commonly overclocked to 160 MHz, thereby giving performance similar to that of a Pentium 90 MHz system. There are four main versions of the socketed version of this CPU, manufactured in different locations. There is the common ADW variety, as well as the later ADY, ADZ and BGC. The later models were the preferred versions of the chip, because they were rated for higher temperatures and thus more forgiving of overclocking.
The Am5x86 made the first-ever use of the controversial PR rating. [7] Because the 5x86 is the equal of a Pentium 75 MHz processor in benchmarks, AMD later marketed the chip as "Am5x86-P75". [8]
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. [9] [10]
AMD manufactured the Am5x86 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 with an AMD 5x86 with a voltage regulator and socket converter, which allows its use on virtually every socketed 486 motherboard ever produced. Several companies also provided upgrades for older 486 notebooks by replacing soldered 486 CPUs. The chips were even used on later Acorn RiscPC "PC card" second processors. The RiscPC's OpenBus memory interface was only 32 bit, which meant that the Pentium could not be easily interfaced to it. Intel's expensive Pentium Overdrive for 486 systems is a troublesome CPU, with many compatibility issues, and so is not used. The 5x86 therefore provided the acme of RiscPC Windows performance.
The chip remained in production for a long time, as it was a popular choice for use in embedded controllers. One derivative of the 5x86 family is the core used in the AMD Élan SC520 family of SoC 00200microcontrollers marketed by AMD. [11] This powers the original Cisco PIX 501 model. [12]
CPU | Model number | Frequency | L1 Cache | FSB | Mult. | Voltage | Package/Socket Type | Release date | Introduction price |
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Am5x86-P75 | X5-133 ADH | 133 MHz | 16 KiB | 33 MHz | 4 | 3.45 V | PGA-168 Socket 1 PGA-168 Socket 2 PGA-168 Socket 3 | 6 November 1995 | $93 |
X5-133 ADY | |||||||||
X5-133 ADW | |||||||||
X5-133 ADZ | |||||||||
X5-133 BGC | |||||||||
X5-133 W16BGC | |||||||||
X5-133 V16BGC | 3.3 V | ||||||||
X5-133 W16BHC | 3.45 V | Surface mounted 208-pin SQFP on PGA-168 | |||||||
X5-133 V16BHC | 3.3 V | ||||||||
X5-133 SFZ | |||||||||
Am5x86-P75+ | X5-150 ADW | 150 MHz | 50 MHz | 3 | 3.45 V | PGA-168 Socket 1 PGA-168 Socket 2 PGA-168 Socket 3 | |||
Am5x86-P100 | X5-160 ADZ | 160 MHz | 40 MHz | 4 | |||||
Reference Guide |
The Cyrix 6x86 is a line of sixth-generation, 32-bit x86 microprocessors designed and released by Cyrix in 1995. Cyrix, being a fabless company, had the chips manufactured by IBM and SGS-Thomson. The 6x86 was made as a direct competitor to Intel's Pentium microprocessor line, and was pin compatible.
The Intel 486, officially named i486 and also known as 80486, is a microprocessor introduced in 1989. It is a higher-performance follow-up to the Intel 386. It represents the fourth generation of binary compatible CPUs following the 8086 of 1978, the Intel 80286 of 1982, and 1985's i386.
The K6 microprocessor was launched by AMD in 1997. The main advantage of this particular microprocessor is that it was designed to fit into existing desktop designs for Pentium-branded CPUs. It was marketed as a product that could perform as well as its Intel Pentium II equivalent but at a significantly lower price. The K6 had a considerable impact on the PC market and presented Intel with serious competition.
The Pentium is a microprocessor introduced by Intel on March 22, 1993. It is the first CPU using the Pentium brand. Considered the fifth generation in the x86 (8086) compatible line of processors, succeeding the i486, its implementation and microarchitecture was internally called P5.
Cyrix Corporation was a microprocessor developer that was founded in 1988 in Richardson, Texas, as a specialist supplier of floating point units for 286 and 386 microprocessors. The company was founded by Tom Brightman and Jerry Rogers.
The Pentium Pro is a sixth-generation x86 microprocessor developed and manufactured by Intel and introduced on November 1, 1995. It introduced the P6 microarchitecture and was originally intended to replace the original Pentium in a full range of applications. Later, it was reduced to a more narrow role as a server and high-end desktop processor. The Pentium Pro was also used in supercomputers, most notably ASCI Red, which used two Pentium Pro CPUs on each computing node and was the first computer to reach over one teraFLOPS in 1996, holding the number one spot in the TOP500 list from 1997 to 2000.
The Cyrix 5x86 is a line of x86 microprocessors designed by Cyrix and released on June 5 of 1995. Cyrix, being a fabless company, had the chips manufactured by IBM. The line came out about 5 months before the more famous Cyrix 6x86. The Cyrix 5x86 was one of the fastest CPUs ever produced for Socket 3 computer systems. With better performance in most applications than an Intel Pentium processor at 75 MHz, the Cyrix Cx5x86 filled a gap by providing a medium-performance processor option for 486 Socket 3 motherboards.
The PR system was a figure of merit developed by AMD, Cyrix, IBM Microelectronics and SGS-Thomson in the mid-1990s as a method of comparing their x86 processors to those of rival Intel. The idea was to consider instructions per cycle (IPC) in addition to the clock speed, so that the processors become comparable with Intel's Pentium that had a higher clock speed with overall lower IPC.
The Pentium OverDrive was a microprocessor marketing brand name used by Intel, to cover a variety of consumer upgrade products sold in the mid-1990s. It was originally released for 486 motherboards, and later some Pentium sockets. Intel dropped the brand, as it failed to appeal to corporate buyers, and discouraged new system sales.
Socket 7 is a physical and electrical specification for an x86-style CPU socket on a personal computer motherboard. It was released in June 1995. The socket supersedes the earlier Socket 5, and accepts P5 Pentium microprocessors manufactured by Intel, as well as compatibles made by Cyrix/IBM, AMD, IDT and others. Socket 7 was the only socket that supported a wide range of CPUs from different manufacturers and a wide range of speeds.
The Am486 is a 80486-class family of computer processors that was produced by AMD in the 1990s. Intel beat AMD to market by nearly four years, but AMD priced its 40 MHz 486 at or below Intel's price for a 33 MHz chip, offering about 20% better performance for the same price.
NexGen, Inc. was a private semiconductor company based in Milpitas, California, that designed x86 microprocessors until it was purchased by AMD in 1996. NexGen was a fabless design house that designed its chips but relied on other companies for production. NexGen's chips were produced by IBM's Microelectronics division in Burlington, Vermont alongside PowerPC and DRAM parts.
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