# XP/S4
**Wikidata**: [Q69791010](https://www.wikidata.org/wiki/Q69791010)  
**Source**: https://4ort.xyz/entity/xp-s4-q69791010

## Summary
XP/S4 is a supercomputer manufactured by Intel, running on the OSF/1 operating system. It was part of the TOP500 list of supercomputers in 1993–1994, achieving peak performance ratings of up to 2.8 gigaflops.

## Key Facts
- **Instance of**: Supercomputer
- **Manufacturer**: Intel (founded 1968-07-18, United States)
- **Operating system**: OSF/1 (variant of Unix)
- **TOP500 system ID**: 749
- **Performance metrics**:
  - Rmax: 1.5–1.75 gigaflops (1993–1994)
  - Rpeak: 2.8 gigaflops (1993–1994)
- **Processor cores**: 56
- **First listed in TOP500**: 1993-06-01
- **Last listed in TOP500**: 1994-11-01

## FAQs
### Q: What company built XP/S4?
A: XP/S4 was manufactured by Intel, a multinational technology company founded in 1968 and headquartered in Santa Clara, California.

### Q: What operating system did XP/S4 use?
A: XP/S4 ran on OSF/1, a Unix-based operating system developed by the Open Software Foundation.

### Q: How powerful was XP/S4?
A: XP/S4 achieved peak performance ratings of up to 2.8 gigaflops (Rpeak) and sustained performance of 1.5–1.75 gigaflops (Rmax) in 1993–1994.

### Q: How many processor cores did XP/S4 have?
A: XP/S4 was equipped with 56 processor cores.

### Q: When was XP/S4 listed in the TOP500?
A: XP/S4 appeared in the TOP500 list from June 1993 to November 1994.

## Why It Matters
XP/S4 was a significant entry in the early 1990s supercomputing landscape, reflecting Intel's growing influence in high-performance computing. As one of the first supercomputers to achieve over 2 gigaflops, it demonstrated Intel's capability in designing powerful parallel processing systems. Its inclusion in the TOP500 list underscores its role in advancing computational capabilities during a critical period in supercomputing history. While not as advanced as later systems, XP/S4 marked an important milestone in Intel's journey toward dominance in the semiconductor industry.

## Notable For
- **Early high-performance computing**: One of the first supercomputers to exceed 2 gigaflops.
- **Intel's supercomputing foray**: Demonstrated Intel's ability to build powerful parallel processing systems.
- **TOP500 inclusion**: Listed from 1993 to 1994, showcasing its relevance in the supercomputing community.
- **OSF/1 compatibility**: Ran on OSF/1, a Unix variant, aligning with industry standards of the time.
- **56-core architecture**: Featured a 56-core design, reflecting early efforts in multi-core processing.

## Body
### Overview
XP/S4 was a supercomputer developed and manufactured by Intel, a leading American technology company. It was part of the TOP500 list of supercomputers, ranking among the most powerful systems of its era.

### Technical Specifications
- **Operating System**: OSF/1, a Unix-based operating system developed by the Open Software Foundation.
- **Performance**:
  - Rmax: 1.5–1.75 gigaflops (1993–1994)
  - Rpeak: 2.8 gigaflops (1993–1994)
- **Processor Cores**: 56, indicating an early multi-core architecture.
- **TOP500 System ID**: 749, reflecting its inclusion in the TOP500 rankings.

### Historical Context
- **Manufacturer**: Intel, founded in 1968, became a key player in semiconductor technology.
- **TOP500 Listings**: XP/S4 appeared in the TOP500 from June 1993 to November 1994, demonstrating its significance in the supercomputing field.

### Significance
XP/S4 was notable for its performance and Intel's role in supercomputing. While not as advanced as later systems, it marked Intel's entry into high-performance computing and contributed to the evolution of supercomputing architectures. Its inclusion in the TOP500 list highlights its impact on the supercomputing community during the mid-1990s.