Supercomputers/Systems/Tachyon II
South Korea · decommissioned · hpc
Tachyon II
Also known as KISTI 4th supercomputer
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
- 274.80 TFlop/s
- Rpeak
- 307.44 TFlop/s
- Rmax ÷ Rpeak
- 89.4%
- Cores
- 26,232
- Power
- 1.27 MW
- Per watt
- 0.2 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 | - Sun Blade x6048 chassis with X6275 blades (Sun Blade 6275 cluster) | Sun Microsystems | - | Verified | top500.orgksc.re.kr |
| CPU | - Intel Xeon X5570 4C 2.93GHz (Nehalem) | Intel | - | Verified | top500.orgksc.re.kr |
| Interconnect | Mellanox InfiniBand QDR Interconnect Fat tree · 40 Gb/s per 4x port InfiniBand QDR, Sun M9 switch | NVIDIA | - | Reported | top500.org |
The read
KISTI's Sun Blade 6275 cluster, the main part of Korea's fourth national supercomputer: 3,200 Sun Blade X6275 nodes with Xeon X5570 2.93 GHz CPUs on InfiniBand QDR. TOP500 lists 26,232 cores, 274.8 TFlop/s Rmax, 307.44 TFlop/s Rpeak and 1,275 kW; it was 24th on the November 2010 list. KISTI's national supercomputing centre history page independently gives the 2009 introduction, the Sun Blade 6275 design, the Nehalem X5570 processors and a 300 TFlop/s theoretical peak (about 25,600 CPUs there against TOP500's 26,232 cores, a difference of counting convention). Status as of is the last TOP500 list it appeared on (November 2015); no retirement notice was found. TOP500 is the only source for Rmax and core count.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
Change history
- 2026-10-02 Added KISTI's Tachyon II Sun Blade cluster
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 and part | Mellanox InfiniBand QDR |
| ksc.re.kr | names system only | - |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.
Further reading
Operating a supercomputer
Acceptance testing, why "installed" and "in production" are six months apart, and the machine lifecycle.
Inside a node
Latency-optimised versus throughput-optimised processors, NUMA, and the end of the host-to-device copy.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.