South Korea has quietly positioned itself as a critical player in the US-China AI competition by dominating the production of high-bandwidth memory chips that power artificial intelligence systems. Samsung Electronics and SK Hynix, the country's two chip giants, supply most of the advanced memory chips helping run AI models like ChatGPT and Claude, and they are expected to maintain roughly 80% of the global market share through 2028. This dominance gives South Korea unexpected geopolitical leverage as Washington and Beijing compete for AI supremacy.

Why Are Memory Chips So Critical to AI?

AI systems need memory chips to store information and perform calculations. As AI models grow larger and more complex, they require increasingly more memory to function. OpenAI's ChatGPT alone has a billion weekly users, and each interaction requires the model to access vast amounts of stored information, including conversation history, to generate responses. High-bandwidth memory, or HBM, is one of two critical components housed in data centers that enable AI to think and respond.

"Because the models are getting bigger and bigger, we're needing more and more memory to run all of these AI workloads," explained Toby Walsh, a professor of artificial intelligence at the University of New South Wales.

Toby Walsh, Professor of Artificial Intelligence, University of New South Wales

The other essential component is graphics processing units, or GPUs, which perform the actual calculations. While Taiwanese company TSMC leads in GPU manufacturing, South Korea's memory chip makers face almost no serious competition in their segment. Demand for these chips heavily outweighs supply, creating what experts call a "sellers' market" where manufacturers can command premium prices.

How Did South Korea Build This Advantage?

South Korea's dominance in memory chips did not happen overnight. The country has spent more than 60 years building technological expertise in semiconductor manufacturing, advancing from making chips for foreign companies to becoming the world leader in memory production. Samsung and SK Hynix invested heavily in the extraordinarily complex manufacturing process required to produce these chips.

Manufacturing memory chips demands equipment costing billions of dollars and precision down to billionths of a meter. The factories must be immaculately clean, with so little room for error that even dust particles can destroy a chip. This requires sophisticated machinery that takes decades to develop, plus vast quantities of water and uninterrupted electrical power. Few countries have invested in building this infrastructure, giving South Korea and its companies a nearly insurmountable advantage.

"Samsung Electronics and SK Hynix are exceptionally well-positioned to maintain their leadership. They possess an enviable advantage in the memory chip space, outperforming competitors," said Peter Kim, global investment strategist at South Korean financial group KB Securities.

Peter Kim, Global Investment Strategist, KB Securities

What Does This Mean for the US-China AI Race?

South Korea's chip dominance has created an unexpected constraint on both American and Chinese AI ambitions. The US maintains advantages in cutting-edge AI research and software, while China is rapidly building its own AI ecosystem and pushing for domestic chip manufacturing. Yet both countries depend on South Korean memory chips to power their AI systems at scale. This dependency gives Seoul significant leverage in the geopolitical competition between Washington and Beijing.

China faces particular challenges because US export controls restrict its access to the most advanced chip technology. As a result, China can only import South Korea's older chip models, forcing it to compensate by deploying larger volumes of less advanced memory chips. Meanwhile, Apple's CEO has complained about "unaffordable semiconductor chip prices," and the company has begun testing chips from China's state-backed CXMT, signaling that even American tech giants are seeking alternatives to South Korea's premium pricing.

The broader pattern reflects a fundamental shift in how the US and China compete. The US approach emphasizes breakthrough innovation and massive capital expenditure, with major AI labs spending over $100 million to train cutting-edge models. China's strategy focuses on engineering efficiency and rapid industrialization, as demonstrated by DeepSeek's ability to build a powerful AI model for less than a tenth of that cost. South Korea's memory chip advantage sits at the intersection of both strategies, making it essential infrastructure for either side to scale AI deployment.

How Is South Korea Responding to This Opportunity?

South Korea is doubling down on its chip leadership with massive new investments. Samsung and SK Hynix announced plans last month to spend $518 billion in building a new chip-making hub in the country's southwest, signaling the government's commitment to maintaining dominance. South Korean President Lee Jae-myung has called this effort a "great leap forward" and pledged to cement the nation's industry leadership in AI infrastructure.

"We must secure the core elements of AI faster than any other country. Semiconductors, physical AI, and AI data centers are the triple axis for a great leap forward," declared South Korean President Lee Jae-myung.

South Korean President Lee Jae-myung

The economic payoff has been substantial. Samsung last week forecast 1,800% growth in second-quarter operating profit from a year earlier, powered by sustained AI-driven demand for memory chips. Both Samsung and SK Hynix have surpassed $1 trillion in market capitalization, joining an exclusive club of mostly American companies. South Korea itself raised its 2026 economic growth forecast by one percentage point to 3%, buoyed by strong performances from its memory chipmakers.

What Risks Could Undermine South Korea's Position?

Despite its commanding market position, South Korea faces several significant risks that could threaten its dominance in the coming years:

• Energy Constraints: South Korea is a smaller country with an industry that is overwhelmingly power-consuming, requiring contingency plans and parallel energy policy implementation to support its mega-projects.
• Talent Poaching: China has aggressively recruited semiconductor engineers from South Korean companies; in 2018, it was discovered that 1,300 former engineers from Samsung and SK Hynix were working at tech startups in mainland China.
• Price Pressure: Major customers like Apple are testing alternatives and pushing back on memory chip prices, potentially forcing South Korean manufacturers to reduce margins or lose market share.
• Geopolitical Entanglement: South Korea, a US military ally, could find itself caught between the great powers, with its companies at the center of US-China tensions.
• Chinese Competition: China is making a state-backed push into memory chip manufacturing to secure its own supply, posing a long-term risk to the global supply-demand balance.

How Can Countries Prepare for a Fragmented AI Chip Market?

The US-China competition is driving what experts call a "digital decoupling," where the two countries and their respective allies form separate technology ecosystems. This fragmentation threatens to slow global innovation by hindering collaboration and forcing countries to choose sides. Several strategies could help mitigate these risks:

• Diversify Supply Chains: Countries should avoid over-reliance on any single supplier by supporting multiple chip manufacturers and investing in domestic semiconductor capacity where feasible.
• Strengthen Alliances: Democracies should coordinate technology policies to ensure that strategic partners like India have genuine access to frontier AI compute and advanced chips, rather than being squeezed out by export restrictions.
• Invest in Efficiency: Following China's example, countries should fund research into more efficient AI models and manufacturing processes that reduce dependence on cutting-edge hardware.
• Support Emerging Players: Nations should nurture homegrown chip designers and AI companies to reduce dependence on South Korea, the US, and China for critical technology infrastructure.

Observers expect South Korea to maintain its dominance for some time, despite efforts by the United States and China to build their own domestic industries. However, the country's position is not guaranteed. As the US-China AI race intensifies and both powers invest heavily in chip self-sufficiency, South Korea's role as the indispensable supplier of memory chips will remain a critical flashpoint in the broader geopolitical competition for technological supremacy.