Supercomputers/Systems/SNU Pegasus
South Korea · operational · hpc
SNU Pegasus
Also known as Pegasus P4 Xeon Cluster
Operated by Seoul National University .
Researched with AI assistance, checked by scripts. These rows were researched by AI agents reading public operator, laboratory and vendor sources, appended by scripts and checked by automated validation; no subject-matter expert has reviewed them (how this site is made). A mechanical second-reader pass has since fetched every cited source: 1350 of 1581 systems have a readable citation that names them, and 64 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
- 1.01 TFlop/s
- Rpeak
- 1.84 TFlop/s
- Rmax ÷ Rpeak
- 54.9%
- Cores
- 400
- 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.
How it compares
Ranked against the other machines in this dataset that report the same figure: those that first came into service within two years of SNU Pegasus, and those in South Korea. Computed from our tables; a metric is ranked only when at least eight peers report it.
| Metric | Value | Against its era | Against its country |
|---|---|---|---|
| Rmax | 1.01 TFlop/s | #42 of 54 · bottom 24% | #30 of 32 · bottom 7% |
| Rmax ÷ Rpeak | 54.9 % | #43 of 54 · bottom 22% | #28 of 32 · bottom 14% |
Every metric is ranked largest-first, so a high power-draw rank means a big power draw, not a good one. Rmax ÷ Rpeak uses HPL-measured results only. Rankings move as machines are added; they describe this dataset, not the world.
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 | - Self-made Pegasus P4 Xeon cluster | Seoul National University | - | Reported | top500.orginfoworld.com |
| CPU | - Intel Pentium 4 Xeon, 400 processors (2.2/2.4/2.8 GHz mix) | Intel | 400 reported | Reported | top500.orginfoworld.com |
The read
Self-built Pentium 4 Xeon cluster (400 processors mixing 2.2, 2.4 and 2.8 GHz parts, Giganet interconnect) at Seoul National University, Rmax 1,011 and Rpeak 1,843 GFlop/s. TOP500 gives the system URL aeroguy.snu.ac.kr. It appeared at rank 56 in June 2003, 128 in November 2003 and 235 in June 2004 (https://www.top500.org/system/168171/); two earlier and later configurations appear as 360 cores in November 2002 (https://www.top500.org/system/168170/, rank 80, Rmax 685.5 GFlop/s) and 520 cores in 2004-05 (https://www.top500.org/system/173852/, rank 231 in November 2004). InfoWorld (5 November 2004) calls Pegasus the university's most powerful machine, a university-built cluster completed in 2002 with about 1 teraflop of maximum performance and 400 Pentium 4 Xeon processors, and says IBM had won an order for a 425-node JS20 blade cluster of up to 5 teraflops due in early 2005; InfoWorld quotes rank 233 where TOP500 shows 235. The list entries carry an MSWindows label in the system name while the TOP500 details page says Linux, an unresolved discrepancy. This record is the 400-core stage, the one TOP500 lists in three consecutive lists.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Change history
- 2026-10-18 Added SNU Pegasus (seoul-national-university)
Nearby in scale
The machines closest to SNU Pegasus by Rmax, smaller to larger.
- Jazz (Argonne LCRC) · USA, decommissioned · 0 PFlop/s
- Blue Horizon · USA, decommissioned · 0 PFlop/s
- KEK SR8000-F1/100 · Japan, decommissioned · 0 PFlop/s
- HLRB SR8000-F1 · Germany, decommissioned · 0 PFlop/s
- GM DL360G3 Cluster · USA, operational · 0 PFlop/s
- AVIDD · USA, operational · 0 PFlop/s
Related systems
Same operator
- Chundoong · South Korea, operational, 2012