80386DX

Original version, released in October 1985.

• Capable of working with 16- or 32-bit external buses
• Cache: depends on mainboard
• Package: PGA-132 or PQFP-132
• Process: First types CHMOS III, 1.5 µm, later CHMOS IV, 1 µm
• Die size: 104 mm² (ca. 10 mm × 10 mm) in CHMOS III and 39 mm² (6 mm × 6.5 mm) in CHMOS IV.
• Transistor count: 275,000
• Specified max clock: 12 MHz (early models), later 16, 20, 25 and 33 MHz