When TSMC's upcoming factories in Arizona will deploy the company's most cutting-edge chip tech remains a major question, despite the extra $100 billion investment in the US.

Taiwan Semiconductor Manufacturing plans to invest $100 billion to build out chip-making facilities in the U.S., according to people familiar with the matter. The company intends to make the investment over the next four years as part of a federal effort that could be announced as soon as later today,

TSMC's announcement comes as chip-maker Intel, which has struggled for years with declining sales and lost market share, has been seeking customers for its own factories in the US.