Intel Pentium

The Intel Pentium is the successor to the i486. It was released in 1993 and brought significant improvements with its P5 architecture such that it was twice as fast as a 486 at a given frequency like the 486 was in comparison to the 386. Pentium refers to the number 5 like in "pentagon" as it would have been i586 if they kept the same naming scheme as the i386 and i486. The first Pentiums were made with a 800 nm process and incorporated 3.1 millions transistors.

There are several versions of P5 based Pentiums:

Early Pentiums were affected by the famous FDIV Bug, and returned an incorrect result for some divisions. Intel initially did not take the problem seriously as the errors would indeed be negligible for most people, but due to the issue quickly becoming well known and causing negative press for them, Intel recalled these processors and replaced them on request.

The Pentium Pro, despite using the name Pentium, was based on a different architecture (P6) and released in 1995, before the Pentium MMX. The Pentium II suceeds the Pentium Pro as a P6 based processor and also adds the MMX instruction set.

Intel ABOXPCPU5V60 Box Intel CBOX8050166SX950 Box
  • A Sealed Box containing a Pentium 60 MHz for Socket 4 (PCPU5V60). Extremely Rare Box. Back.
  • A Sealed Box from the recall program, containing a FDIV Bug free replacement for an affected Socket 4 Pentium 67 MHz. Back.
Intel A80501-60 SX753 Intel A80501-60 SX835 Intel A80502-90 Intel A80502-100
Intel PODP5V83 SU014 Intel FV80503 Mechanical Sample Intel PP133
  • A 60 MHz Pentium for Socket 4 without Golden Heatsink, affected by the FDIV Bug (SX753). Bottom. Malaysia, 1993 Week 41.
  • A 60 MHz Pentium for Socket 4 with Golden Heatsink, affected by the FDIV Bug (SX835). Bottom. Malaysia, 1993 Week 51.
  • A 90 MHz Pentium for Socket 5 with Golden Heatsink, affected by the FDIV Bug (SX879). Bottom. Malaysia, 1993 Week 41.
  • A 100 MHz Pentium for Socket 5 without Golden Heatsink, unaffected by the FDIV Bug (SX963). Bottom. Malaysia, 1995 Week 12.
  • A 83 MHz Pentium OverDrive for upgrading Socket 2 and 3 i486s (SU014). Without Fan, Bottom. 1995 Week 46.
  • A Pentium MMX Mechanical Sample (not intended for sale) Socket 7. Usual Pentium MMX look like it, though Ceramic versions also exist. We tried to run it and it works normally! Bottom.
  • A 133 MHz Mobile Pentium, to be soldered on a Laptop Motherboard for example. Bottom, With Original Carrier. 1997 Week 47.
Intel Pentium Keychain Intel Pentium Keychain Intel Pentium Dice Intel 80P54C Wafer Intel 80P54C Wafer
Blank Intel A80502 Blank Intel A80502
  • A Keychain with a Pentium 80501 Die.
  • Two Pentium 80502 Dice.
  • A 8" Silicon Wafer of Intel 80502 (80P54C) Chips. More Views: 2, 3a, 3b, 3c, 3e, 3f, 3g, 3h, 3i.
  • A Blank Pentium A80502.

Operating System Support

FDIV Bug on Windows 7 Aero on Pentium MMX!
  • The FDIV Bug on Windows 7 with the well known 4195835/3145727 operation. The built-in calculator is not affected and returns the correct result, while the calculation on PowerShell used the FPU and is incorrect. An affected Socket 5 100 MHz SX960 was used - CPU-Z Validation.
  • Aero can work on Pentium MMX, here with a GeForce 6200. A Tillamook 267 SL2Z4 running at 385 MHz was used - CPU-Z Validation.

The experiments were conducted on a Gigabyte GA-5AX. The AGP Aperture Size should be reduced to 16 MB to avoid Windows running for some reason in 16 colors mode and failing to load the graphics drivers.