By Marcus Bennett

SK Hynix has replaced Samsung as the world's largest DRAM chipmaker, ending Samsung's long hold on the top spot. The South Korean rival, a key memory supplier to Nvidia, rose on surging demand for AI-related chips, according to a report by the South China Morning Post.

The shift marks a rare change at the top of the global memory market. Samsung has led the DRAM industry for years. SK Hynix, the smaller of Korea's two memory giants, closed the gap as data centre builders ramped up spending on artificial intelligence hardware.

Why did SK Hynix take the lead?

The mechanism is straightforward. AI systems need memory that moves data at high speed. SK Hynix built its position as a supplier of high-bandwidth memory (HBM) to Nvidia, whose GPUs power most large AI training clusters.

Samsung did not win the same share of that business. The result shows up in the revenue rankings. SK Hynix's AI-linked sales grew fast enough to overtake its larger competitor in total DRAM revenue, the report said.

This is not a story about one good quarter. It reflects which supplier aligned its product roadmap with the AI build-out first, and which one arrived later.

What does this change for the memory market?

For buyers, the practical question is pricing and supply. A reshuffle at the top can shift bargaining power between the big memory suppliers and their customers. Data centre operators negotiate hard on HBM contracts, and a market leader has more leverage in those talks.

For Samsung, the loss of the top spot puts pressure on its memory division to win back AI customers. For SK Hynix, the lead brings both revenue and capacity strain, since HBM output competes with conventional DRAM for wafer space.

What comes next?

The ranking battle between Korea's two memory giants will likely continue, with the following factors in play:

• Demand for HBM tied to Nvidia's GPU shipments
• Samsung's efforts to qualify its own HBM products with major AI customers
• Overall DRAM pricing, which remains cyclical

One long sentence worth holding on to: a market leadership built on a single customer segment, however fast-growing, remains exposed to the timing of AI infrastructure spending, and both suppliers know that demand cycles can turn as quickly as they arrived.