SK Ulsan AI Data Center

Also known as SK Telecom AWS Ulsan AI data center; Ulsan AIDC

Operated by SK Telecom at SK Ulsan AI Data Center Site .

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: -
Rpeak: -
Rmax ÷ Rpeak: -
Cores: -
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	- SK Telecom and SK Ecoplant build the Ulsan AI data center; SK Broadband and SK Gas support	SK Telecom 017670KRX	-	Reported	investkorea.org koreaherald.com
Integrator	- AWS is the technical partner; the facility incorporates AWS technical requirements	Amazon AMZNNASDAQ	-	Reported	investkorea.org lightreading.com

AI datacenter metrics

Figures beyond an accelerator count, each with who stated it. What can and cannot be compared across AI datacenters.

Metric	Value	As of	Basis	Note	Source
Accelerators	60,000 accelerators	2025-08	Design target	Planned GPU count at full build-out per Light Reading; vendor not named.	lightreading.com
Facility power	40 MW	2027-11	Design target	Phase 1 of the Ulsan site, completion Nov 2027 per Light Reading; full 100 MW by Feb 2029 (live row covers 100 MW).	lightreading.com
Facility power	100 MW	2025-08	Design target	100 MW at full build-out (40 MW by November 2027, full by February 2029); IT versus facility load not stated.	lightreading.com thetechcapital.com

Compute deals

2025-06-20: Amazon and SK Telecom (joint venture , 100 MW). lightreading.com techblog.comsoc.org

All compute deals. Headline values are as announced, not additive.

The read

A GPU-dedicated AI data center that SK Telecom, SK Ecoplant and Amazon Web Services broke ground on in Ulsan in late August 2025 (Invest Korea dates it 1 September, Light Reading and The Tech Capital say August), described as Korea's largest AI facility outside the Seoul area. Light Reading reports a 100 MW facility with 60,000 GPUs, and The Tech Capital reports 40 MW in 2027 scaling to 100 MW; Light Reading gives the phases as 40 MW by November 2027 and full capacity by February 2029. The Korea Herald adds 20 to 40 kW racks with hybrid cooling capable of 40 to 100 kW per rack. No GPU vendor is named on the fetched pages, the Invest Korea page gives no figures, and the figures come from trade press, so the tier is reported.

Timeline

2025-06 Announced source

Site & facility