Intel 486SX 33MHz Processor A80486SX-33 SX797 Socket 3 CPU i486SX

Intel 486SX 33MHz Processor A80486SX-33 SX797 Socket 3 CPU i486SX

The Intel A80486SX-33 is a 33 MHz 486SX-class processor in a ceramic PGA package, identified by the SX797 stepping code. The 486SX is a variant of Intel's i486 architecture with the floating-point unit (FPU/math coprocessor) disabled, running at 33 MHz on a 32-bit internal data bus. It is designed for Socket 3 (168-pin PGA) motherboards and is fully compatible with the 487SX math coprocessor socket upgrade.

Specifications & What's Included

• Manufacturer: Intel
• Part Number: A80486SX-33
• Stepping / S-Spec: SX797
• Clock Speed: 33 MHz
• Bus Speed: 33 MHz
• Socket: Socket 3 (168-pin PGA)
• Data Bus: 32-bit internal, 32-bit external
• Address Bus: 32-bit (4 GB addressable)
• L1 Cache: 8 KB unified on-die
• FPU: Not present (487SX co-processor socket upgrade compatible)
• Voltage: 5V
• Manufacturing process: 1-micron CMOS
• Country of manufacture: Malaysia (visible on underside)
• Pins: Gold PGA — intact, no bending or corrosion observed
• Processor only — no heatsink or fan included

Applications

The Intel 486SX family was the mainstream desktop and workstation processor of the early 1990s, powering a wide range of IBM-compatible PCs running MS-DOS, Windows 3.x, and early Windows 95 systems. The 33 MHz 486SX was a common mid-range option during this era, used in both consumer and business desktops on Socket 3 motherboards from manufacturers such as ASUS, Gigabyte, AMI, and Award BIOS-based OEM boards. Today these processors are sought by vintage computer collectors and enthusiasts restoring or building period-accurate 486-era machines. The SX797 stepping is a well-known revision of the A80486SX-33, and collectors often search by S-spec when sourcing spares or upgrade chips for legacy systems.