Intel Paragon XP/S 150

Also known as XP/S-MP 150

Operated by Oak Ridge National Laboratory at Oak Ridge Leadership Computing Facility .

Phase 1 seed dataset, compiled by hand. These rows were built from public operator, laboratory and vendor sources. A mechanical second-reader pass has since fetched every cited source: 1092 of 1153 systems have a readable citation that names them, and 40 are genuinely weakly sourced. Every claim carries its source and a confidence tier. Treat anything below verified as a lead, not a citation.

Measured performance

Rmax: 127.1 GFlop/s
Rpeak: 154.0 GFlop/s
Rmax ÷ Rpeak: 82.5%
Cores: 3,072
Power: -
Per watt: - GF/W

Figures are as last publicly reported for the configuration described below, not a live measurement. Where a system was upgraded in place, the post-upgrade configuration is shown and the earlier one appears in the timeline.

What this machine is made of

One row per supplier relationship. “Supplier at build” is the company that shipped the part at the time; where that company has since been acquired, the parent it rolls up to today is shown beside it. That distinction is what makes ticker-level aggregation possible across a thirty-year dataset.

Role	Part	Supplier at build	Quantity	Confidence	Source
Integrator	- Intel Paragon XP/S-MP 150	Intel INTCNASDAQ	-	Reported	top500.org ornl.gov
CPU	Intel i860/XP CPUs i860 RISC · 1C · 0.05 GHz · 1000 nm Intel i860 XP 50 MHz	Intel INTCNASDAQ	3,072 reported	Reported	top500.org ornl.gov
Interconnect	Intel Paragon 2D mesh Interconnect 2D mesh with torus wraparound · 200 MB/s per link 2-D mesh (torus)	Intel INTCNASDAQ	-	Reported	top500.org ornl.gov

The read

Intel's largest Paragon, installed at ORNL's Center for Computational Sciences in January 1995 and dedicated that April as the last machine under a 1992 contract. ORNL describes 1,024 compute nodes with three i860 processors each (3,096 processors, over 150 GFlop/s peak); TOP500 counts 3,072 cores and 127.1 GFlop/s Rmax, third on the June 1995 list and again in December 1995, and it stayed listed until November 1999. The June 1995 list is the edition recorded here. No source we fetched gives a shutdown date, so none is recorded. TOP500 is the only source for Rmax, so the tier is reported.

Timeline

1995-01 First operational source
1995-06 List debut at #3 (June 1995) source

Public list appearances

Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.

#3: TOP500, June 1995 →

Site & facility

Oak Ridge Leadership Computing Facility

Location: Oak Ridge, TN, USA
Utility: Tennessee Valley Authority
Cooling: Direct liquid cooling (warm water)
Commissioned: 1993

olcf.ornl.gov ornl.gov

Change history

2026-10-02 Added the Intel Paragon XP/S 150 at Oak Ridge, third on the June 1995 TOP500

Source check

We fetched this system's own citations and recorded whether each page actually mentions it. This is a corroboration signal, not a fact check, and it is published so you can see how well the sourcing holds up rather than take it on trust.

Cited source	Result	Found on the page
top500.org	names system only	· counts: 3072
ornl.gov	could not be fetched	-

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.