ORNL Paragon XP/S 35

Also known as Intel XP/S 35; XP/S35

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: 1263 of 1345 systems have a readable citation that names them, and 56 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: 15.2 GFlop/s
Rpeak: 26.0 GFlop/s
Rmax ÷ Rpeak: 58.5%
Cores: 512
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 35	Intel INTCNASDAQ	-	Reported	top500.org
CPU	Intel i860/XP CPUs i860 RISC · 1C · 0.05 GHz · 1000 nm Intel i860 XP 50 MHz, 512 processors	Intel INTCNASDAQ	512 reported	Reported	top500.org
Interconnect	Intel Paragon 2D mesh Interconnect 2D mesh with torus wraparound · 200 MB/s per link Paragon 2-D mesh (torus)	Intel INTCNASDAQ	-	Reported	top500.org

The read

TOP500 lists an Intel XP/S 35 at Oak Ridge National Laboratory installed in 1992 with 512 Intel i860 50 MHz processors on a 2-D mesh running OSF/1, 15.2 GFLOPS Rmax and 26.0 GFLOPS peak, eighth on the November 1993 list, and it stayed on the list until June 1998. It predates and is distinct from ORNL's XP/S 150, which is recorded separately. TOP500 is the only source fetched, so the tier is reported. The June 1998 list is the last evidence of operation and is recorded as the status date.

Timeline

1992 First operational source
1993-11 List debut at #8 (November 1993) source

Public list appearances

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

#8: TOP500, November 1993 →

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

2026-10-09 Added ORNL Paragon XP/S 35

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.

Every source cited on this page was readable, and none of them mentions this system. They are cited at page granularity, normally because no stable deep link could be found. That is a real weakness in this row and it is why the system carries a confidence tier below verified. See how this check works.

Cited source	Result	Found on the page
top500.org	does not name this system	· counts: 512

Checked 2026-10-13 by pnpm verify. Re-run it and the table changes with the web.