the 80486 CPU is interesting because saying something is "as fast as a 486" is essentially meaningless. they were sold in speeds from 16 to 100 MHz, at a time when clockspeed was almost a pure indicator of true performance. that's more than a sixfold difference in speed. so if you run Doom on a 486SX-25, it'll be nearly unplayable; on a 486DX4-100, it'll run better than many Pentiums.
