AMD opens EFB front beyond CoWoS, putting Taiwan substrate trio in play

AMD’s push into Embedded Fan-Out Base (EFB) substrates marks a strategic bypass of TSMC’s CoWoS bottleneck, reshaping how HPC chips are physically realized. The capacity expansions by Taiwan, China’s substrate trio—ITEQ, Kinwong, and Nan Ya PCB—are less about AI demand surges and more a symptom of extreme geographic concentration in high-end substrates. This creates acute supply chain fragility: any U.S. export controls on advanced packaging materials or accelerated ABF substrate localization in mainland China could destabilize their customer base and margins. NVIDIA and Intel will likely accelerate in-house packaging R&D or qualify Korean/Japanese alternatives to mitigate single-region risk. Within 18 months, substrate supply will emerge as one of the most geopolitically sensitive choke points in AI hardware—not dictated by cost, but by tech sovereignty.