Binary Countdown Integrated Circuit

Cyrix 6x86 Microprocessor

Although Intel never produced chips termed 586s or 686s, the Cyrix 6x86 microprocessors were designed to compete with the Pentium 166 and the Advanced Micro Devices (AMD) K5 PR166, the so-called "Pentium killer". As with the AMD K5 and K6, Cyrix 6x86s received a P-rating that enabled the consumer to compare these clones to Intel Pentium performance, although internally, they are very different designs and not always compatible.