AI infrastructure investment enthusiasm led by Nvidia is spreading quickly to a wider range of hardware companies, CNBC reported on Thursday.

This week, AMD and Intel shares rose about 25% each. Memory company Micron jumped more than 35%, while fiber optic cable maker Corning climbed about 20%. All four have more than doubled this year.

Intel posted the biggest rise, up more than 200%. Nvidia has gained 16% this year, roughly in line with the Nasdaq's return.

Mizuho analyst Jordan Klein (조던 클라인) called it the clearest sign yet of an "AI lead stock rotation".

The memory market is the hottest. Micron's market value topped $800 billion for the first time this week, and its shares have risen more than 750% over the past year.

Micron CEO Sanjay Mehrotra (산제이 메로트라) said in March that key customers have been able to secure only 50 to 67% of the volume they need due to supply shortages.

The CPU market is also in focus. CPU demand is surging as the center of gravity shifts from chatbots to AI agents. Bank of America forecasts the data center CPU market will grow to more than double, from $27 billion in 2025 to $60 billion in 2030. AMD's revenue, net profit and outlook all beat market expectations in its earnings this week. AMD CEO Lisa Su (리사 수) projected the server CPU market will grow 35% over the next 3 to 5 years, sharply higher than the 18% forecast in November.

Some analysts are warning that the scale of the semiconductor rally resembles the late-1990s dotcom bubble. BTIG analyst Jonathan Krinsky (조너선 크린스키) warned that a 25 to 30% correction could come after the PHLX Semiconductor Index has risen 66% this year.