# XP/S4
**Wikidata**: [Q69817056](https://www.wikidata.org/wiki/Q69817056)  
**Source**: https://4ort.xyz/entity/xp-s4-q69817056

## Summary
XP/S4 is a supercomputer manufactured by Intel. It ran the OSF/1 variant of Unix (and is associated with Tru64 UNIX) and is listed on the TOP500 with system ID 862; its reported peak performance was Rpeak 2.6 gigaflops and measured Rmax 1.62 gigaflops in 1994, and it used 52 processor cores.

## Key Facts
- XP/S4 is an instance of a supercomputer.
- Manufacturer: Intel (American multinational technology company; inception 1968-07-18; headquartered in Santa Clara, United States).
- Operating system: OSF/1 (a variant of the Unix operating system developed by the Open Software Foundation).
- Also associated with Tru64 UNIX (operating system; inception 1992-01-01; country: United States).
- TOP500 system ID: 862.
- Reported Rmax (measured performance): 1.62 gigaflops (point in time: 1994-06-01 and 1994-11-01).
- Reported Rpeak (theoretical peak): 2.6 gigaflops (point in time: 1994-06-01 and 1994-11-01).
- Number of processor cores: 52.

## FAQs
### Q: What is XP/S4?
A: XP/S4 is a supercomputer built by Intel. It was recorded on the TOP500 list under system ID 862 and reported peak and measured performances in 1994.

### Q: What operating system does XP/S4 use?
A: XP/S4 runs OSF/1, a Unix variant developed by the Open Software Foundation. It is also associated with Tru64 UNIX in the provided records.

### Q: How fast is XP/S4?
A: XP/S4 had a reported theoretical peak (Rpeak) of 2.6 gigaflops and a reported measured performance (Rmax) of 1.62 gigaflops in 1994 (measurements noted for June and November 1994).

### Q: How many processor cores does XP/S4 have?
A: XP/S4 used 52 processor cores.

## Why It Matters
XP/S4 is a documented example of a mid-1990s supercomputer configuration produced by a major semiconductor and systems manufacturer, Intel. Its recorded metrics — a theoretical peak of 2.6 gigaflops and a measured Rmax of 1.62 gigaflops in 1994 — provide a concrete data point for the performance capabilities of parallel compute systems of that era. The use of OSF/1 and the association with Tru64 UNIX show the role of Unix-derived operating systems in high-performance computing deployments at the time. Being listed on the TOP500 (system ID 862) means XP/S4 was formally benchmarked and compared against contemporaneous systems, making it part of the historical record used by researchers and historians to track architectural trends, operating-system choices, and performance scaling. For anyone studying the evolution of supercomputing hardware, software stacks, or Intel’s participation in HPC, XP/S4 represents a verifiable instance with specific performance and configuration data.

## Notable For
- Manufactured by Intel, a major technology company with headquarters in Santa Clara, United States.
- Running OSF/1, a Unix variant developed by the Open Software Foundation.
- Associated with Tru64 UNIX in the system's software context (Tru64 UNIX inception recorded as 1992-01-01).
- TOP500 listing under system ID 862.
- Reported performance values in 1994: Rmax 1.62 gigaflops and Rpeak 2.6 gigaflops; 52 processor cores.

## Body

### Overview
- XP/S4 is cataloged as a supercomputer.
- The system appears in TOP500 records with system ID 862.
- It was manufactured by Intel.

### Hardware
- Number of processor cores: 52.
- Manufacturer: Intel (a U.S.-based multinational technology company founded 1968-07-18, headquartered in Santa Clara).

### Performance
- Measured (Rmax) performance: 1.62 gigaflops.
  - Point in time recorded: 1994-06-01 and 1994-11-01.
- Theoretical peak (Rpeak) performance: 2.6 gigaflops.
  - Point in time recorded: 1994-06-01 and 1994-11-01.
- These performance figures are reported in the system’s TOP500-related data.

### Operating system
- Primary operating system listed: OSF/1.
  - OSF/1 is described as a variant of the Unix operating system developed by the Open Software Foundation.
- The system is also associated with Tru64 UNIX.
  - Tru64 UNIX is recorded as an operating system with an inception date of 1992-01-01 and country: United States.

### TOP500 listing
- TOP500 system identifier: 862.
- Performance values (Rmax and Rpeak) correspond to TOP500-style benchmarking entries from 1994.

### Manufacturer context
- Intel is listed as the manufacturer of XP/S4.
- Intel’s provided metadata includes founding date (1968-07-18) and headquarters location (Santa Clara, United States).

### Technical summary
- Instance of: supercomputer.
- Manufacturer: Intel.
- Operating systems: OSF/1; associated with Tru64 UNIX.
- Cores: 52.
- Performance: Rmax 1.62 GFLOPS, Rpeak 2.6 GFLOPS (1994 measurements).
- TOP500 ID: 862.