I486SL
The Intel i486SL is the power-saving variant of the i486DX microprocessor. The SL was designed for use in mobile computers. It was produced between November 1992 and June 1993. Clock speeds available were 20, 25 and 33 MHz. The i486SL contained all features of the i486DX. This version performed more than twice and consumes 50% less power than the Intel386 SL version.
Source: Wikipedia
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