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Intel’s CPU story began with a processor designed for a calculator and reached, by 1995, a chip aimed at high-end desktops, workstations and servers. Along the way, the 8080 helped broaden the market for general-purpose microprocessors, while the 8086 architecture—and the 8088 variant in the original IBM PC—gave Intel’s processor line a lasting platform role. This first installment follows that shift through the Pentium Pro.
How to read the specifications
The dates and specification figures below are Intel’s historical product-table values. They are manufacturer-reported reference points, not a normalized performance test across different processor architectures. Clock speed and transistor count alone do not show how quickly processors handled real workloads.
“Addressable memory” is reproduced as Intel lists it for the named model. It should not be read as a promise that every system using that processor could use all of that memory.
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4004: a processor for a calculator
Intel dates the 4004 to November 1971. Its product table lists a 108 kHz clock, 2,300 transistors and 640 bytes of addressable memory, and places the chip in the context of a Busicom calculator. The original application matters: the 4004 was part of a customer-specific solution, not the beginning of a ready-made desktop-computer market.
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Intel’s corporate history calls the 4004 “the world’s first electronically programmable microprocessor.” That is Intel’s characterization; the sources cited here do not settle broader disputes over how “first microprocessor” should be defined.
8008 and 8080: widening the processor’s role
8008: from calculator work toward terminals and control
Intel dates the 8008 to April 1972 and lists 200 kHz and 3,500 transistors. Intel’s 2024 retrospective says the chip was designed for Computer Terminal Corporation’s Datapoint 2200 programmable terminal. Intel’s product guide also associates it with calculators, bottling machines and data or character manipulation. Those examples show a move beyond the 4004’s calculator-specific setting, even as processors remained tied to particular applications.
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8080: a broader market takes shape
Introduced in April 1974, the 8080 is listed by Intel at 2 MHz, 6,000 transistors and 64 KB of addressable memory. Intel connects it with the Altair computer as well as control applications. In a December 16, 2024 retrospective, Intel described the launch as a turning point beyond mostly customer-specific chip designs. The article quoted 8080 designer Federico Faggin: “The 4004 and 8008 suggested it, but the 8080 made it real.” This is a retrospective account from Intel, not an independent ruling on who created the microprocessor market.
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Intel introduced the 8086 in June 1978. The company lists 29,000 transistors and 1 MB of addressable memory, and describes its architecture as a template for future chips. Intel also says the 8086 was its first processor to contain microcode.
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The 8088 followed in June 1979. Intel lists the same 29,000-transistor count but 64 KB of addressable memory, and identifies the 8088—not the 8086—as the 8086 variant used as the IBM PC’s CPU. Intel dates that computer’s launch to August 12, 1981. The distinction is important: the 8086 established the architectural line, while the 8088 carried it into a particularly influential personal-computer platform.
80286 and 80386: expanding the PC family
80286: a larger listed memory range
Intel dates the 80286 to February 1982. Its product table lists 134,000 transistors and 16 MB of addressable memory. Those figures indicate how Intel’s listed specifications had grown from the early 8-bit-era parts, but the table alone does not establish the processor’s operating modes or how particular software behaved.
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80386: distinguish the DX and SX
The 80386 DX arrived in October 1985, with Intel listing 275,000 transistors and 4 GB of addressable memory. Intel’s table dates the 386 SX to June 1988 and lists 16 MB of addressable memory for that variant. The memory figures belong to different models; treating them as one generic “386” specification would erase a material distinction.
80486 and Pentium: the line continues
80486: cache enters the listed specification
Intel dates the 486 DX to April 1989 and lists 1.2 million transistors, 8 kB of cache and 4 GB of addressable memory. A later 486 SX entry is dated September 1991 and has a different transistor count. The historical table presents the DX and SX as distinct models, so the DX figures should not be applied to every 486.
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Pentium: a new name for a continuing x86 line
The first Pentium arrived in March 1993, according to Intel, which lists 3.1 million transistors. Intel’s timeline presents it as a continuation of x86 while dropping the “86” naming convention. The product-history figures establish a new generation and name, but they are not a controlled comparison of performance with earlier processors.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Pentium Pro: an endpoint aimed at high-end computing
Introduced in November 1995, Pentium Pro marked a shift in the market emphasis of this story: Intel positioned it for high-end desktop computers, workstations and servers. Intel lists 5.5 million transistors, 150–200 MHz models and L2 cache configurations of 256 KB, 512 KB or 1 MB. Its timeline also says the U.S. Department of Energy selected the processor to power a new supercomputer.
From a calculator component to a chip chosen for high-end systems and a supercomputer, Intel’s first quarter-century of processors was as much a story of expanding applications and platforms as of rising specification counts. The 4004 began in a defined customer context; the 8080 widened the processor’s reach; and the 8086 line became associated with a major PC platform. Pentium Pro closes this installment at the point where Intel’s history had extended well beyond personal computers.
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Intel CPU milestones from 1971 to 1995
| Processor | Intel-listed introduction | Original use or platform context | Clock and transistors | Addressable memory and other listed details |
|---|---|---|---|---|
| 4004 | November 1971 | Busicom calculator | 108 kHz; 2,300 | 640 bytes |
| 8008 | April 1972 | Datapoint 2200 programmable terminal; Intel also lists calculator, bottling-machine and data/character-manipulation uses | 200 kHz; 3,500 | 16 KB |
| 8080 | April 1974 | Altair computer and control applications | 2 MHz; 6,000 | 64 KB |
| 8086 | June 1978 | Architecture Intel describes as a template for future chips | Clock: not stated in the cited Intel product-table figures; 29,000 | 1 MB |
| 8088 | June 1979 | 8086 variant used as the IBM PC’s CPU | Clock: not stated in the cited Intel product-table figures; 29,000 | 64 KB |
| 80286 | February 1982 | Not stated in the cited Intel historical product-table entry | Clock: not stated in the cited Intel product-table figures; 134,000 | 16 MB |
| 80386 DX | October 1985 | Not stated in the cited Intel historical product-table entry | Clock: not stated in the cited Intel product-table figures; 275,000 | 4 GB |
| 80386 SX | June 1988 | Not stated in the cited Intel historical product-table entry | Clock and transistor count: not stated in the cited Intel product-table figures | 16 MB |
| 80486 DX | April 1989 | Not stated in the cited Intel historical product-table entry | Clock: not stated in the cited Intel product-table figures; 1.2 million | 4 GB; 8 kB cache |
| 80486 SX | September 1991 | Not stated in the cited Intel historical product-table entry | Transistor count differs from the 486 DX; exact count and clock are not stated in the cited figures | Not stated in the cited Intel historical product-table figures |
| Pentium | March 1993 | Continued Intel’s x86 line under a new name | Clock: not stated in the cited Intel product-table figures; 3.1 million | Not stated in the cited Intel historical product-table figures |
| Pentium Pro | November 1995 | High-end desktops, workstations, servers; selected by the U.S. Department of Energy for a new supercomputer | 150–200 MHz models; 5.5 million | 256 KB, 512 KB or 1 MB L2 cache; addressable memory not stated in the cited Intel product-table figures |
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