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The 486s are very similar to their immediate predecessor, the Intel 80386DX. The main differences are that the 486 has an optimised instruction set, has an on-chip unified instruction and data cache, an optional on-chip floating-point unit (FPU), and an enhanced {bus interface unit}. These improvements yield a rough doubling in performance over an Intel 80386 at the same clock rate. There are several suffixes and variants including: Intel 486SX - a 486DX with its FPU disabled (see crippleware). Intel 486DX - 486SX with a working FPU. 486DX-2 - runs at twice the external clock rate. 486SX-2 - runs at twice the external clock rate. 486SL - 486DX with power conservation circuitry. 486SL-NM - 486SX with power conservation circuitr スポンサード リンク
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