i686 may refer to the following:
- Intel P6 (microarchitecture), as first used in the Pentium Pro and later adapted into the Pentium M and Core architectures
- In open source and especially Linux computing, it refers to compiler optimization for Pentium Pro and all later Intel processors, and the Athlon and all later AMD processors[citation needed], as compared to "i386" builds that are slower but more compatible with older processors
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