. The successor to the 80386 processor, Intel 80486 (i486) added new important features:
Floating Point Unit was integrated with the processor
Internal clock doubling and tripling allowed the processor to run much faster in existing motherboards.
Power management features and SMM (System Management Mode) became a standard feature of the processor.
The AMD 5x86 was clock quadrupled, and performed almost as fast as a Pentium 75. This is the low profile version used on embedded systems as well as Evergreen Upgrade kits.