Cyrix 6x86
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A Cyrix 6x86 Processor
The architecture of the 6x86 is more advanced than that of the Intel Pentium, incorporating some of the features of the Intel Pentium Pro. At a given clock rate it executes most code more quickly than a Pentium would. However, its FPU is considerably less efficient than Intel's.
Note that the 6x86 and 6x86L weren't completely compatible with the Intel Pentium instruction set. It is for this reason that by default the chip identified itself as a 486 and disabled the CPUID instruction. CPUID support could be enabled by first enabling extended CCR registers then setting bit 7 in CCR4.
A later release of the 6x86, the 6x86MX, added MMX compatibility and quadrupled the primary cache size to 64 kilobytes.
- This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL.