# XP/S25
**Wikidata**: [Q69818715](https://www.wikidata.org/wiki/Q69818715)  
**Source**: https://4ort.xyz/entity/xp-s25-q69818715

## Summary
The XP/S25 is a supercomputer manufactured by Intel. It operates on the OSF/1 operating system and utilizes a system architecture comprising 336 processor cores. During its operational peak in the late 1990s, it achieved a maximum performance (Rmax) of 10 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:** 336
*   **TOP500 System ID:** 869
*   **Max Performance (Rmax):** 10 Gigaflops (recorded between 1995 and 1997)
*   **Peak Performance (Rpeak):** 16.8 Gigaflops (recorded between 1995 and 1997)

## FAQs
### Q: Who manufactured the XP/S25?
A: The XP/S25 was manufactured by Intel, a major American technology company known for its role in the semiconductor industry.

### Q: What operating system does the XP/S25 use?
A: The system runs on OSF/1, which is a variant of the Unix operating system developed by the Open Software Foundation.

### Q: What was the processing speed of the XP/S25?
A: The supercomputer had a maximum verified performance (Rmax) of 10 gigaflops and a theoretical peak performance (Rpeak) of 16.8 gigaflops.

## Why It Matters
The XP/S25 represents a specific era of high-performance computing history where Intel acted not just as a chip supplier but as the manufacturer of full supercomputer systems. With 336 processor cores, the machine exemplifies the parallel processing architectures of the mid-1990s used to achieve double-digit gigaflop speeds. Its consistent performance metrics—maintaining an Rmax of 10 gigaflops across multiple ranking periods between 1995 and 1997—demonstrate the stability and capability of Intel's supercomputing hardware during that period. The use of OSF/1 further highlights the reliance on Unix variants for high-end scientific computation before the widespread dominance of Linux in later decades.

## Notable For
*   **Manufacturing Origin:** It is a notable example of a supercomputer directly manufactured by Intel, distinct from systems that merely utilize Intel processors.
*   **Sustained Performance:** The system maintained consistent performance records (10 GFLOPS Rmax) over a two-year period across five distinct reporting dates (December 1995 to November 1997).
*   **Scale:** It utilized a substantial core count of 336 for its time to achieve its processing power.

## Body

### Technical Specifications
The XP/S25 is defined by its robust hardware configuration and specific performance metrics.
*   **Cores:** The system is equipped with 336 processor cores.
*   **Performance:** The computer achieved a Linpack pack performance (Rmax) of 10 gigaflops. Its theoretical peak performance (Rpeak) was 16.8 gigaflops. These metrics were recorded consistently across several points in time, including December 1995, June 1996, November 1996, June 1997, and November 1997.

### Software Environment
The XP/S25 operated using **OSF/1**.
*   **OSF/1:** This is a variant of the Unix operating system developed by the Open Software Foundation.
*   **Context:** OSF/1 is historically related to Tru64 UNIX, an operating system inception date of 1992.

### Manufacturer Details
The entity behind the XP/S25 is **Intel**.
*   **Organization Type:** American multinational technology company.
*   **Industry:** Semiconductor industry and electrical industry.
*   **Headquarters:** Santa Clara, California, United States.