# XP/S4
**Wikidata**: [Q69803296](https://www.wikidata.org/wiki/Q69803296)  
**Source**: https://4ort.xyz/entity/xp-s4-q69803296

## Summary
XP/S4 is a supercomputer developed by Intel that ran on the OSF/1 operating system and was part of the Top500 list of supercomputers. It achieved peak performance of 2.8 gigaflops and was notable for its 56 processor cores, making it a significant system in the 1990s.

## Key Facts
- **Instance of**: Supercomputer
- **Manufacturer**: Intel
- **Operating system**: OSF/1
- **Top500 system ID**: 799
- **Peak performance**: 2.8 gigaflops (Rpeak, 1994)
- **Maximum performance**: 1.75 gigaflops (Rmax, 1994)
- **Number of processor cores**: 56
- **Runs on**: OSF/1 (Unix variant) and Tru64 UNIX
- **First performance measurement**: 1.5 gigaflops (Rmax, 1993)

## FAQs
### Q: What company manufactured XP/S4?
A: XP/S4 was manufactured by Intel, a leading American technology company specializing in semiconductors.

### Q: What operating systems did XP/S4 support?
A: XP/S4 ran on OSF/1, a Unix variant developed by the Open Software Foundation, and Tru64 UNIX.

### Q: What was XP/S4's peak performance?
A: XP/S4 achieved a peak performance of 2.8 gigaflops (Rpeak) in 1994, with a maximum performance of 1.75 gigaflops (Rmax).

### Q: How many processor cores did XP/S4 have?
A: XP/S4 was equipped with 56 processor cores, contributing to its computational power.

### Q: When was XP/S4 first listed in the Top500?
A: XP/S4 was assigned the Top500 system ID 799, indicating its inclusion in the Top500 list of supercomputers.

## Why It Matters
XP/S4 was a notable supercomputer in the late 1990s, leveraging Intel's semiconductor technology to deliver significant computational power. Its performance metrics, including peak and maximum gigaflops, reflect the advancements in supercomputing during that era. By running on OSF/1 and Tru64 UNIX, it demonstrated compatibility with Unix-based systems, which were widely used in scientific and industrial applications. XP/S4's inclusion in the Top500 list underscores its role as a high-performance computing system, contributing to the field of supercomputing and supporting complex computational tasks.

## Notable For
- **Top500 inclusion**: XP/S4 was listed in the Top500 supercomputers, a prestigious ranking of the world's most powerful systems.
- **Performance metrics**: Achieved 2.8 gigaflops (Rpeak) and 1.75 gigaflops (Rmax), showcasing its computational power.
- **Processor cores**: Equipped with 56 cores, a significant number for its time, enhancing its processing capabilities.
- **Operating system compatibility**: Supported OSF/1 and Tru64 UNIX, demonstrating its adaptability to Unix-based environments.
- **Historical significance**: Represents a key system in the evolution of supercomputing, particularly in the late 1990s.

## Body
### Overview
XP/S4 is a supercomputer manufactured by Intel, known for its performance and inclusion in the Top500 list of supercomputers. It operated on the OSF/1 operating system and was compatible with Tru64 UNIX, reflecting its alignment with Unix-based computing standards.

### Performance
XP/S4 achieved peak performance of 2.8 gigaflops (Rpeak) and maximum performance of 1.75 gigaflops (Rmax) in 1994. Earlier measurements in 1993 recorded 1.5 gigaflops (Rmax) and 2.8 gigaflops (Rpeak), indicating steady performance improvements over time.

### Technical Specifications
- **Processor cores**: 56
- **Operating systems**: OSF/1 and Tru64 UNIX
- **Top500 ID**: 799

### Historical Context
XP/S4 was part of the supercomputing landscape in the late 1990s, contributing to the field's advancements in computational power. Its inclusion in the Top500 list highlights its status as a high-performance system, supporting complex scientific and industrial applications.