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NexGen was a short-lived company that designed x86 PC central processing units until it was purchased by AMD in 1996. Its Nx586 CPU, introduced in 1994, was the first CPU to attempt to compete directly against Intel's Pentium, with its Nx586-P80 and Nx586-P90 CPUs. 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 84 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.
Compaq, who 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.
NexGen's follow-up design became the basis for the commercially successful AMD K6.
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