# XP/S20
**Wikidata**: [Q70082108](https://www.wikidata.org/wiki/Q70082108)  
**Source**: https://4ort.xyz/entity/xp-s20-q70082108

## Summary
XP/S20 is a supercomputer developed by Intel, running on the OSF/1 operating system. It was a high-performance computing system with 256 processor cores, achieving peak performance of 12.8 gigaflops in 1995.

## Key Facts
- **Instance of**: Supercomputer
- **Manufacturer**: Intel (American multinational technology company)
- **Operating system**: OSF/1 (variant of Unix)
- **Top500 system ID**: 1595
- **Performance**:
  - Rmax: 7.6 gigaflops (June 1995)
  - Rpeak: 12.8 gigaflops (June 1995)
  - Rmax: 7.6 gigaflops (December 1995)
  - Rpeak: 12.8 gigaflops (December 1995)
- **Processor cores**: 256
- **First used**: 1995 (performance metrics recorded in June and December)

## FAQs
### Q: What company built the XP/S20 supercomputer?
A: The XP/S20 was developed by Intel, a leading American technology company specializing in semiconductors.

### Q: What operating system did XP/S20 use?
A: XP/S20 ran on OSF/1, a variant of the Unix operating system developed by the Open Software Foundation.

### Q: How many processor cores did XP/S20 have?
A: XP/S20 had 256 processor cores, contributing to its high-performance computing capabilities.

### Q: What was the peak performance of XP/S20?
A: XP/S20 achieved a peak performance of 12.8 gigaflops (Rpeak) in 1995, with sustained performance of 7.6 gigaflops (Rmax).

### Q: When was XP/S20 first documented in performance rankings?
A: XP/S20 was listed in the Top500 supercomputer rankings with ID 1595, with performance metrics recorded in June and December 1995.

## Why It Matters
The XP/S20 was a significant supercomputer in the late 1990s, leveraging Intel's semiconductor technology and OSF/1 to deliver high-performance computing capabilities. With 256 processor cores and peak performance of 12.8 gigaflops, it represented a milestone in early supercomputing. Its inclusion in the Top500 rankings underscores its role in advancing computational power during a critical era in high-performance computing. While not as widely recognized as later systems, XP/S20 contributed to the evolution of supercomputing infrastructure, supporting scientific and industrial applications that required substantial computational resources.

## Notable For
- **High-core architecture**: One of the first supercomputers with 256 processor cores, showcasing early parallel processing capabilities.
- **Top500 inclusion**: Ranked with ID 1595, reflecting its status as a notable system in 1995.
- **Performance metrics**: Achieved 12.8 gigaflops (Rpeak) and 7.6 gigaflops (Rmax), demonstrating strong computational power for its time.
- **OSF/1 compatibility**: Ran on OSF/1, a Unix variant, aligning with industry standards for operating systems in supercomputing.
- **Intel manufacturing**: Built by Intel, highlighting the company's role in early supercomputer development.

## Body
### Overview
XP/S20 is a supercomputer developed by Intel, first documented in 1995. It was part of the Top500 supercomputer rankings with ID 1595, indicating its significance in high-performance computing at the time.

### Technical Specifications
- **Processor cores**: 256, enabling parallel processing and high computational throughput.
- **Performance**:
  - Rpeak: 12.8 gigaflops (June and December 1995)
  - Rmax: 7.6 gigaflops (June and December 1995)
- **Operating system**: OSF/1, a Unix-based system developed by the Open Software Foundation.

### Historical Context
- **Manufacturer**: Intel, a leading American technology company specializing in semiconductors.
- **First use**: Performance metrics recorded in June and December 1995, reflecting its role in late 1990s supercomputing.

### Significance
- **Top500 ranking**: Inclusion in the Top500 supercomputer rankings underscores its importance in early high-performance computing.
- **Industry impact**: XP/S20 contributed to the evolution of supercomputing infrastructure, supporting applications requiring substantial computational resources.