The fastest 386 was the 486SX. ;) Interestingly, the 487SX was a complete 486DX that disabled the original 486SX. https://micro.magnet.fsu.edu/optics/olympusm

The fastest 386 was the 486SX. ;) Interestingly, the 487SX was a complete 486DX that disabled the original 486SX. https://micro.magnet.fsu.edu/optics/olympusmicd/galleries/chips/intel487sxa.html https://micro.magnet.fsu.edu/optics/olympusmicd/galleries/ch... EDIT: IBM's LC chips were targeted at laptops initially but then found their way into embedded systems. Cyrex (used in the BL line) was often slightly ahead in performance and performance/price, but compatibility wasn't always there.