# XP/S4
**Wikidata**: [Q69801762](https://www.wikidata.org/wiki/Q69801762)  
**Source**: https://4ort.xyz/entity/xp-s4-q69801762

## 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 of 2.8 gigaflops and sustained performance of up to 1.75 gigaflops.

## Key Facts
- **Instance of**: Supercomputer
- **Manufacturer**: Intel (founded 1968)
- **Operating system**: OSF/1 (Unix variant)
- **TOP500 system ID**: 793
- **Peak performance**: 2.8 gigaflops (Rpeak, 1993–1994)
- **Sustained performance**: 1.75 gigaflops (Rmax, 1993–1994)
- **Processor cores**: 56
- **Supported OS**: Tru64 UNIX (inception 1992)

## FAQs
### Q: What company built XP/S4?
A: XP/S4 was manufactured by Intel, an American multinational technology company founded in 1968.

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

### Q: What was XP/S4's peak performance?
A: XP/S4 achieved a peak performance of 2.8 gigaflops (Rpeak) in 1993–1994.

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

### Q: Was XP/S4 part of the TOP500 list?
A: Yes, XP/S4 was listed in the TOP500 supercomputers with system ID 793.

## Why It Matters
XP/S4 was a significant supercomputer in the late 1990s, contributing to computational advancements during a critical period in high-performance computing. Its performance metrics—peak and sustained gigaflops—reflect the capabilities of Intel's hardware and OSF/1's software at the time. As part of the TOP500, it played a role in benchmarking and advancing supercomputing standards. While not as powerful as modern systems, XP/S4 was a key player in its era, demonstrating Intel's engineering prowess and the effectiveness of Unix-based operating systems in high-performance environments.

## Notable For
- **TOP500 inclusion**: Listed with system ID 793, indicating its recognition in the supercomputing community.
- **Performance metrics**: Achieved 2.8 gigaflops (Rpeak) and 1.75 gigaflops (Rmax), showcasing its computational power.
- **Processor cores**: Featured 56 cores, a notable specification for its time.
- **Operating system compatibility**: Supported both OSF/1 and Tru64 UNIX, demonstrating versatility in software environments.
- **Intel manufacturing**: Built by Intel, a leader in semiconductor technology, highlighting the company's role in supercomputing infrastructure.

## Body
### Overview
XP/S4 is a supercomputer manufactured by Intel, part of the TOP500 list with system ID 793. It ran on OSF/1, a Unix variant, and supported Tru64 UNIX, another Unix-based operating system.

### Performance
XP/S4 achieved peak performance of 2.8 gigaflops (Rpeak) and sustained performance of 1.75 gigaflops (Rmax) in 1993–1994. These metrics were recorded in both June and November of these years, reflecting consistent performance over time.

### Hardware
The system featured 56 processor cores, a significant specification for its era. Intel's manufacturing capabilities were crucial in delivering this hardware, which contributed to XP/S4's computational power.

### Operating Systems
XP/S4 supported both OSF/1 and Tru64 UNIX, demonstrating compatibility with multiple Unix variants. This flexibility was likely advantageous for users and developers working in high-performance computing environments.

### Historical Context
XP/S4 was active during a period of rapid advancements in supercomputing. Its inclusion in the TOP500 underscores its role in benchmarking and performance standards of the late 1990s. While not as powerful as modern systems, it represented a milestone in Intel's contributions to high-performance computing.