# XP/S5
**Wikidata**: [Q69741807](https://www.wikidata.org/wiki/Q69741807)  
**Source**: https://4ort.xyz/entity/xp-s5-q69741807

## Summary
The XP/S5 is a supercomputer manufactured by Intel. It operates on the OSF/1 operating system and utilizes a architecture containing 66 processor cores. During the mid-1990s, the system achieved a consistent maximum performance (Rmax) of 2.06 gigaflops.

## Key Facts
- **Classification:** Supercomputer
- **Manufacturer:** Intel
- **Operating System:** OSF/1 (a variant of the Unix operating system developed by the Open Software Foundation)
- **Processor Cores:** 66
- **TOP500 System ID:** 627
- **Max Performance (Rmax):** 2.06 Gigaflops (recorded consistently from November 1993 to June 1995)
- **Peak Performance (Rpeak):** 3.3 Gigaflops (recorded consistently from November 1993 to June 1995)

## FAQs
### Q: What type of operating system does the XP/S5 use?
A: The XP/S5 runs on OSF/1, which is a variant of the Unix operating system developed by the Open Software Foundation.

### Q: What was the processing power of the XP/S5?
A: The XP/S5 had a peak performance (Rpeak) of 3.3 gigaflops and a maximum recorded performance (Rmax) of 2.06 gigaflops during its benchmarking history between 1993 and 1995.

### Q: Who manufactured the XP/S5?
A: The XP/S5 was manufactured by Intel, an American multinational technology company specializing in the semiconductor industry.

## 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, a leader in the semiconductor industry, this supercomputer represents the architectural approaches used to achieve gigaflop-level processing speeds before the advent of modern petaflop-scale systems.

Its inclusion in the TOP500 list (System ID 627) validates its significance in the global landscape of computational power at the time. The machine's reliance on OSF/1 also highlights the prominence of Unix variants in scientific and enterprise computing environments during that era. By integrating 66 processor cores, the XP/S5 demonstrated the viability of parallel processing to solve complex computational problems, setting groundwork for the multi-core processors ubiquitous in computing today.

## Notable For
- Being a specific Intel-manufactured supercomputer entry on the TOP500 list.
- Utilizing OSF/1, a distinct Unix variant, rather than the more common proprietary UNIX flavors of the time.
- Maintaining consistent performance metrics (2.06 Rmax / 3.3 Rpeak) across multiple benchmarking periods (1993–1995).
- Operating with 66 processor cores, a specific configuration for parallel computing in the 1990s.

## Body

### System Architecture and Manufacturer
The XP/S5 is defined as a **supercomputer** and was manufactured by **Intel**. Intel, a major American technology company headquartered in Santa Clara, United States, utilized its expertise in the semiconductor industry to produce this system. The XP/S5 belongs to a class of computing systems that were ranked on the internationally recognized TOP500 list, assigned the system identifier **627**.

### Operating Environment
The system operates on **OSF/1**. This operating system is a variant of Unix that was developed by the Open Software Foundation. The choice of OSF/1 positions the XP/S5 within a specific lineage of enterprise and scientific computing environments that relied on open systems software during the early 1990s.

### Performance Metrics
The computer performance of the XP/S5 was tracked over several periods in the mid-1990s, showing high consistency in its operational output.

*   **Rmax (Max Performance):** The system consistently recorded an Rmax of **2.06 gigaflops** across four distinct reporting periods: November 1993, June 1994, November 1994, and June 1995.
*   **Rpeak (Peak Performance):** The theoretical peak performance for the system was recorded at **3.3 gigaflops** during the same time intervals.
*   **Cores:** The system achieved these speeds using a configuration of **66 processor cores**.