Home » Comparisons » Difference Between 80386 and 80486 Microprocessor

Difference Between 80386 and 80486 Microprocessor:

The difference between 80386 and 80486 Microprocessor is given in table below

80386 microprocessor

80486 microprocessor

Intel 80386 was developed in 1985 using CHMOS III technology and it is improved version of 80286. Intel 80486 was developed by Intel in 1989 using CHMOS IV technology and it is improved version of 80386.
It is available with 275K transistors in a 132-pin PGA package. The 80486 is available with 1200K transistors packaged in a 168-pin grid array package.
80386 operated at clock speed of 16 MHz to 33 MHz. The 25 MHz, 33 MHz, 50 MHz and 100 MHz (DX-4) versions of 80486 are available in the market.
On-Chip cache is not available in 80386. 8 KB unified level-1 cache for code and data is available to the CPU. In advanced versions of the 80486 processor, the size of level 1 cache has been increased to 16 KB.
4.0 MIPS at 25 MHz. Most of the instructions require 2 CLK for execution. 15.0 MIPS at 25 MHz. Most of the instructions require 1 CLK for execution.
The 80386 processor supports Intel 80387 numeric data processor. There is no on-chip numeric data processor. Numeric data processor (floating point unit) is integrated with the 80486 processor. Therefore the delay in communications between the CPU and FPU has been eliminated and all floating point instructions are executed with in very few CPU cycles.
The 80386 processor has a 16-byte prefetch queue. 80486 processor has a 32-byte prefetch queue.
The 80386 processor has no multiprocessing support capability. The 80386 processor has multiprocessing support capability.
The 80386 has less power management capability compared to 80486. The 80486 has 2-3 times more power management capability compared to 80386
There is no RISC feature in 80386. RISC feature is incorporated in 80486.
The alignment check (AC) flag does not exist in 80386. The alignment Check (AC) flag exists in 80486.