Samsung Electronics and SK Hynix on Monday unveiled plans to build four new semiconductor fabrication plants as part of an 800 trillion won ($518 billion) project in South Korea, one of the biggest investments yet linked to the global artificial intelligence (AI) boom.
Under the plan, the two chipmakers will build two fabrication plants each in South Korea’s southwest region. The broader project will also include suppliers, infrastructure and advanced semiconductor facilities, creating one of the world’s largest chip manufacturing ecosystems.
The sheer scale of the investment has grabbed headlines. But the bigger question is: why are two of the world’s largest chipmakers investing so aggressively?
The answer lies in AI.
The rise of AI has dramatically increased demand for semiconductors.
Every AI model, from ChatGPT and Gemini to enterprise AI systems used by businesses, relies on vast amounts of computing power. Training and running these systems requires massive data centres packed with advanced processors and memory chips.
That demand has fundamentally changed the semiconductor business.
For years, chipmakers relied heavily on demand from smartphones, laptops and consumer electronics. Today, AI infrastructure has emerged as one of the industry’s fastest-growing markets, with technology companies racing to build the computing capacity needed to support AI services.
As a result, demand for advanced chips has surged.
Samsung and SK Hynix are not just any semiconductor companies. They are among the world’s largest producers of memory chips, a critical component in AI systems. These chips allow AI models to process, store and move enormous amounts of data at high speeds.
SK Hynix has emerged as a dominant supplier of High-Bandwidth Memory (HBM), a specialised type of memory that has become essential for AI servers and Nvidia’s AI accelerators. Samsung is also aggressively expanding its presence in the HBM market as competition intensifies.
As AI adoption grows, demand for such memory chips is expected to increase sharply.
That puts both companies in a strategic position within the global AI supply chain.
Building a semiconductor fabrication plant is among the most expensive industrial investments a company can make.
New fabs cost billions of dollars, take years to construct and require confidence that demand will remain strong long after the facilities become operational.
Companies do not commit to multiple fabs unless they believe the opportunity is long-term.
The decision by Samsung and SK Hynix to expand capacity therefore signals confidence that AI-driven demand for advanced semiconductors is likely to remain strong for years rather than quarters.
It is also a recognition that the AI race is increasingly becoming an infrastructure race.
While consumers interact with AI through chatbots and applications, those services depend on a vast network of chips, servers, memory modules and data centres operating behind the scenes.
The implications of the announcement extend far beyond South Korea.
The chips produced by Samsung and SK Hynix eventually power data centres and AI systems used by companies around the world. As global demand for AI services grows, so does the need for the hardware supporting them.
The project also reflects a broader trend playing out across the technology industry.
Governments and companies are investing heavily in semiconductor manufacturing as they seek to secure their place in the AI economy. The United States has launched major initiatives to boost domestic chip production, while China continues investing heavily in its semiconductor sector despite export restrictions.
South Korea’s strategy is different. Rather than competing across every segment of the semiconductor market, it is doubling down on its strength in memory chips, an area where Samsung and SK Hynix already enjoy global leadership.
The announcement comes at a time when investors are debating whether spending on AI infrastructure can continue at its current pace.
Samsung and SK Hynix appear to have made their view clear.
By committing to a project worth 800 trillion won, the two companies are effectively signalling that they expect demand for AI infrastructure to keep growing as businesses, governments and consumers adopt the technology.
In that sense, the four new fabrication plants are not merely factories.
They are a reflection of how the world’s biggest chipmakers see the future: one in which artificial intelligence becomes an increasingly important driver of demand for the technologies that power the digital economy.