The 80386 was capable of 11 million instructions per second (MIPS) and featured:
- Protected mode capabilities.
- 32-bit registers and instruction set.
- A paging translation unit for better virtual memory support.
- Speeds from 12Mhz to 40Mhz.
- Increased memory support, to 4GB.
The 80386 was also released in subsequent versions including the 386SX, a lower cost version lacking a math coprocessor. 386SL is the low-power version intended for mobile computers.
Some 386 processors had a bug that could cause a lock-up when running in a 32-bit environment. It was very hard for an end user to determine whether the problem was a software bug or a hardware flaw. To address the issue, Intel created a certified testing program whereby chips found to be error free were marked with a double sigma.