# Cyrix Cx486DX2

> microprocessor

**Wikidata**: [Q1148852](https://www.wikidata.org/wiki/Q1148852)  
**Source**: https://4ort.xyz/entity/cyrix-cx486dx2

## Summary
The Cyrix Cx486DX2 is a microprocessor developed by Cyrix, released in 1992 as part of the x86 architecture family. It featured clock speed doubling technology, enabling it to operate at higher internal speeds than its external bus, and competed directly with Intel’s 80486 and AMD’s Am486 processors. This chip played a notable role in the 1990s microprocessor market by offering performance enhancements at competitive prices.

## Key Facts
- **Manufacturer**: Cyrix
- **Release Year**: 1992
- **Clock Speed**: Up to 100 MHz (internal), with external bus speeds of 33 or 50 MHz
- **Architecture**: x86-compatible, 32-bit
- **Codename**: IBM 486 (used in some IBM systems)
- **Related Entities**: Intel 80486, AMD Am486, Cyrix 6x86
- **Image**: [Cyrix 486 DX2 66MHz](https://commons.wikimedia.org/wiki/Special:FilePath/Cyrix_486_dx2_66mhz_2007_03_27.jpg)
- **Sitelink Count**: 4 (Wikipedia languages: de, eo, no, commons)
- **Aliases**: Cx486DX2
- **Wikidata Description**: microprocessor

## FAQs
### Q: When was the Cyrix Cx486DX2 released?
A: The Cyrix Cx486DX2 was released in 1992, positioning it as a competitor to Intel’s 486 processors during the early 1990s microprocessor boom.

### Q: What technology made the Cyrix Cx486DX2 unique?
A: It utilized clock doubling technology, allowing the internal processor core to run at twice the speed of the external memory bus (e.g., 66 MHz internally with a 33 MHz bus).

### Q: How did the Cyrix Cx486DX2 compare to Intel’s 486?
A: While compatible with Intel’s x86 architecture, the Cx486DX2 offered competitive pricing and performance optimizations, though it faced challenges in market adoption due to Intel’s dominance.

### Q: What notable systems used the Cyrix Cx486DX2?
A: It was used in select IBM systems under the codename “IBM 486,” reflecting its integration into mainstream computing hardware of the era.

## Why It Matters
The Cyrix Cx486DX2 is significant as an early example of x86-compatible processors that challenged Intel’s market dominance. By incorporating clock doubling—a technique to boost performance without requiring faster (and more expensive) system buses—it exemplified innovation in cost-effective processor design. This approach influenced the broader microprocessor industry, pushing competitors to adopt similar strategies for optimizing speed and affordability. The Cx486DX2 also highlighted the growing importance of intellectual property and reverse-engineered compatibility in the semiconductor sector, contributing to the evolution of x86 architecture into the modern era.

## Notable For
- **Clock Doubling Technology**: Early adoption of internal clock speed multiplication for performance gains.
- **x86 Compatibility**: Demonstrated the feasibility of third-party processors adhering to Intel’s instruction set architecture.
- **IBM Partnership**: Utilized in IBM systems under a custom codename, showcasing strategic industry collaborations.
- **Market Competition**: Played a role in the “clone” processor market of the 1990s, pressuring Intel to innovate and adjust pricing strategies.

## Body

### Release and Market Context
The Cyrix Cx486DX2 debuted in 1992 amid intense competition in the microprocessor sector. As a x86-compatible chip, it targeted systems compatible with Intel’s 80486 but offered differentiated features like clock doubling. This allowed the processor to run at 50 or 66 MHz internally while maintaining a 33 or 50 MHz external bus speed, optimizing performance in cost-sensitive applications.

### Technical Architecture
- **Clock Doubling**: The core innovation, marketed as a way to achieve higher performance without relying on faster (and more costly) memory and peripheral components.
- **x86 Compatibility**: Adherence to Intel’s instruction set ensured compatibility with existing software, a critical factor for adoption in the PC market.
- **Fabrication**: Produced using CMOS technology, aligning with industry standards for power efficiency and thermal management.

### Competitive Landscape
- **Intel 80486**: The primary competitor, against which the Cx486DX2 positioned itself through aggressive pricing and performance tuning.
- **AMD Am486**: A contemporaneous alternative from AMD, reflecting the broader trend of third-party x86 processors challenging Intel’s dominance.
- **Cyrix 6x86**: A subsequent Cyrix product building on the DX2’s legacy, emphasizing continued innovation in the x86 space.

### Legacy and Impact
The Cx486DX2 contributed to Cyrix’s reputation as a formidable competitor in the 1990s microprocessor market. Its clock doubling technology set a precedent for subsequent processors, including those from Intel and AMD, which later adopted similar strategies (e.g., Intel’s Pentium OverDrive). While Cyrix ultimately did not surpass Intel or AMD in market share, the DX2 remains a notable example of iterative innovation in semiconductor design during a pivotal era for personal computing.

### Related Entities and Specifications
- **Manufacturer**: Cyrix (later acquired by VIA Technologies)
- **Release Year**: 1992
- **Maximum Clock Speed**: 100 MHz (internal)
- **Bus Speed**: 33/50 MHz
- **Process Technology**: 0.5 μm (later variants)
- **Power Consumption**: ~3.5 W (typical)
- **Package Type**: PGA (Pin Grid Array)
- **Notable Users**: IBM (under the “IBM 486” designation), various OEM systems

### Documentation and Resources
- **Image**: A photograph of the Cyrix 486 DX2 66MHz variant is available via Wikimedia Commons, illustrating its physical design and packaging.
- **Wikipedia Coverage**: Documented in German, Esperanto, Norwegian, and Commons wikis, reflecting its niche but recognized status in computing history.