# XP/S5
**Wikidata**: [Q69782381](https://www.wikidata.org/wiki/Q69782381)  
**Source**: https://4ort.xyz/entity/xp-s5-q69782381

## Summary
XP/S5 is a supercomputer manufactured by Intel. It operates using the OSF/1 operating system and is equipped with 66 processor cores. The system is capable of a peak performance (Rpeak) of 3.3 gigaflops and a maximal performance (Rmax) of 2.06 gigaflops.

## Key Facts
- **Classification:** Supercomputer
- **Manufacturer:** Intel (American multinational technology company)
- **Operating System:** OSF/1 (a variant of Unix developed by the Open Software Foundation)
- **Processor Cores:** 66
- **TOP500 System ID:** 729
- **Performance (Rmax):** 2.06 Gigaflops (recorded in 1993–1995)
- **Performance (Rpeak):** 3.3 Gigaflops (recorded in 1993–1995)

## FAQs
### Q: Who manufactured the XP/S5 supercomputer?
A: The XP/S5 was manufactured by Intel, a major American technology company headquartered in Santa Clara, United States.

### Q: What operating system does the XP/S5 run on?
A: The XP/S5 runs on OSF/1, which is a variant of the Unix operating system developed by the Open Software Foundation. It is also associated with the Tru64 UNIX class of operating systems.

### Q: What is the processing power of the XP/S5?
A: The XP/S5 has a peak performance (Rpeak) of 3.3 gigaflops and a maximum sustained performance (Rmax) of 2.06 gigaflops.

## Why It Matters
The XP/S5 serves as a historical marker in the evolution of high-performance computing during the early to mid-1990s. Manufactured by Intel—traditionally known for semiconductor components rather than complete supercomputer systems—the XP/S5 demonstrates the company's direct involvement in the enterprise and scientific computing markets during that era.

With 66 processor cores, the XP/S5 represented a significant parallel processing capability for its time. Its consistent performance metrics between 1993 and 1995 (maintaining an Rmax of 2.06 gigaflops) highlight the stability of the architecture during a period of rapid technological change. The use of OSF/1 places it within a specific lineage of Unix development, catering to enterprise-level stability and open systems standards advocated by the Open Software Foundation. This system exemplifies the transition from monolithic proprietary systems to architectures utilizing standardized Unix variants and mass-market processor technologies.

## Notable For
- **Intel Manufacturing:** It is a complete supercomputer system manufactured directly by Intel, distinguishing it from systems that merely utilize Intel components.
- **Parallel Processing:** Utilizing 66 distinct processor cores was a notable configuration for achieving gigaflop-level performance in the early 1990s.
- **Unix Implementation:** Its reliance on OSF/1 represents a specific chapter in Unix history, utilizing an OS developed by the Open Software Foundation (later becoming Tru64 UNIX).
- **Consistent Performance:** The system maintained a steady Rmax of 2.06 gigaflops across multiple benchmarking periods (November 1993 through June 1995).

## Body

### Hardware and Architecture
The XP/S5 is classified as a supercomputer. It is built with a parallel architecture consisting of **66 processor cores**. The system was built by **Intel**, a company founded in 1968 and prominent in the semiconductor industry.

### Performance Metrics
The performance of the XP/S5 was tracked on the TOP500 list (System ID 729). Its technical specifications include:
- **Rmax (Maximal Performance):** 2.06 Gigaflops
- **Rpeak (Theoretical Peak Performance):** 3.3 Gigaflops

These performance figures were recorded consistently across several dates, including November 1993, June 1994, November 1994, and June 1995.

### Software Environment
The XP/S5 operates on **OSF/1**, a variant of the Unix operating system.
- **OSF/1:** Developed by the Open Software Foundation.
- **Tru64 UNIX:** The system is also associated with Tru64 UNIX (formerly OSF/1), a 64-bit Unix operating system for the Alpha architecture, which had its inception in 1992.