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Title: Nx586  
Author: World Heritage Encyclopedia
Language: English
Subject: P5 (microarchitecture), Reduced instruction set computing, X86, Superscalar, Pentium Pro, CPU socket, X87, 586 (disambiguation)
Publisher: World Heritage Encyclopedia


Industry Semiconductors
Fate Purchased by AMD
Successor(s) AMD
Founded 1986
Defunct 1996
Headquarters Milpitas, California, USA
Products Microprocessors
Website (archived page from 1996-11-12)

NexGen (Milpitas, California) was a private semiconductor company that designed x86 microprocessors until it was purchased by AMD in 1996.[1] Like competitor Cyrix, 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.

The company was best known for the unique implementation of the x86 architecture in its processors. NexGen's CPUs were designed much differently than other processors based on the x86 instruction set at the time: the processor would translate code designed to run on the traditionally CISC-based x86 architecture to run on the chip's internal RISC architecture.[2] The architecture was used in later AMD chips such as the K6, and to an extent most x86 processors today implement a "hybrid" architecture similar to those used in NexGen's processors.


The company was founded in 1986 by Thampy Thomas, being funded by Compaq, ASCII and Kleiner Perkins. Its first design was targeted at the 80386 generation of processors. But the design was so large and complicated it could only be implemented using eight chips instead of one and by the time it was ready, the industry had moved onto the 80486 generation.

Its second design, the Nx586 CPU, was introduced in 1994, was the first CPU to attempt to compete directly against Intel's Pentium, with its Nx586-P80 and Nx586-P90 CPUs. Unlike competing chips from AMD and Cyrix, the Nx586 was not pin-compatible with the Pentium or any other Intel chip and required its own custom NxVL-based motherboard and chipset. NexGen offered both a VLB and a PCI motherboard for the Nx586 chips.

Like the later Pentium-class CPUs from AMD and Cyrix, clock for clock it was more efficient than the Pentium, so the P80 ran at 75 MHz and the P90 ran at 83.3 MHz. Unfortunately for NexGen, it measured its performance relative to a Pentium using an early chipset; improvements included in Intel's first Triton chipset increased the Pentium's performance relative to the Nx586 and NexGen had difficulty keeping up. Unlike the Pentium, the Nx586 had no built-in math coprocessor; an optional Nx587 provided this functionality.

In later Nx586's, a x87 math coprocessor was included on-chip.[3] Using IBM's multichip module (MCM) technology, NexGen combined the 586 and 587 die in a single package. The new device, which used the same pinout as its predecessor, was marketed as the Nx586-PF100 to distinguish it from the FPU-less Nx586-P100.

Compaq, which had backed the company financially, announced its intention to use the Nx586 and even struck the name "Pentium" from its product literature, demos, and boxes, substituting the "586" moniker, but never used NexGen's chip widely.

AMD purchased NexGen when AMD's K5 chip failed to meet performance and sales expectations.


External links

  • NexGen datasheets
  • CPU-INFO: NexGen Nx586, indepth processor history
  • AMD: Nx586 Processor (archived version)
  • cpu-world: Nx586 Processor
  • Nx586
  • Nx686
  • : NexGen Nx587 information and pictures
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