AMD and Nvidia's GPUs are currently built on 4 nm-class silicon by TSMC. And they're not exactly cheap. Meanwhile, TSMC has indicated that it would like to put the prices it charges to chip designers up. In that context, the prospect of IBM's newly announced sub-1 nm silicon is both very exciting and totally terrifying.
As for the details, IBM is claiming "the introduction of the world’s first sub-1 nanometer (nm) chip technology, featuring a revolutionary transistor architecture at the 0.7 nm, or 7 angstrom node."
