Samsung is expanding its Pyeongtaek semiconductor complex in South Korea, where three fabs already run around the clock and a fourth is coming online. According to MIT Technology Review, construction of a fifth fab stopped during the 2024 memory downturn and restarted once AI demand surged. The build-out is Samsung’s effort to regain the lead in memory chips.

Why memory is the pressure point

Generative AI runs on GPUs, and those GPUs depend on stacks of specialized memory packaged alongside the processor. That makes memory capacity a direct limit on how many AI accelerators the industry can ship. Much of the public conversation about AI hardware focuses on the processor designers and the foundries that make their chips. The memory makers sit one layer down, and their factories are just as hard to build and slow to scale.

Samsung has a specific problem to solve. MIT Technology Review reports that for years the company watched domestic rival SK Hynix pull ahead in the high-bandwidth memory that feeds Nvidia’s AI accelerators. Pyeongtaek is how Samsung intends to close that gap with raw manufacturing capacity.

A bet made through a downturn

The halted fifth fab is the most telling detail. Memory is a cyclical business, and in 2024 demand dropped far enough that Samsung paused construction. Restarting it shows how quickly the AI boom changed the calculation. It also shows the risk. Fabs take years to build, so Samsung is committing capital now against demand it expects to last. The company predicts memory demand will keep surging through 2028, and the spending only pays off if that forecast holds.

The local picture backs up the urgency. The reporter describes thousands of construction workers on a campus about the size of Central Park, with shuttle buses, short-term apartment leases and work continuing after lunch. One safety officer said pay on site beats other construction jobs and that she expects the boom to keep her busy. A chip cycle at this scale reshapes a farming city’s economy, which raises the stakes if demand softens again.

What to watch next

  • Whether the fourth fab reaches production on schedule and how fast the fifth proceeds.
  • Whether Samsung wins a larger share of high-bandwidth memory supply for Nvidia’s accelerators.
  • Whether demand tracks Samsung’s forecast through 2028 or repeats the 2024 slump.
  • How TSMC’s foundry dominance and SK Hynix’s lead shape the competitive balance.

For people building on AI infrastructure, the takeaway is that supply of specialized memory is as strategic as supply of GPUs. A second large producer competing hard in that segment would ease a bottleneck. The outcome depends on execution at Pyeongtaek, and on whether the demand that justified restarting construction proves durable.

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