Export controls and the US–China compute gap

Plain English. US rules restricting the sale of advanced AI accelerators, and the tools to make them, to China. China's response is domestic substitution — Huawei and Cambricon silicon, Beijing procurement mandates — plus a grey market in diverted hardware.

Why it moves money. Controls reprice Nvidia's addressable market, hand Chinese chipmakers a protected home market — TrendForce forecasts domestic accelerators taking 90 per cent of China's market (projected) — and create a smuggling premium documented at the indictment stage in Taiwan. The load-bearing detail investors mostly miss: the gap is not one number. DeepSeek's 160,000-unit Huawei order is for inference, while its training stays on Nvidia — Chinese silicon can serve tokens at scale but has not displaced Nvidia where frontier models are made, and the binding constraints sit below the chips, in memory, packaging and fabrication.

What to watch. The training/inference split on Chinese silicon — the day a frontier-class Chinese model trains end-to-end on domestic chips is the regime change; licensing swings in Washington; and stack-level comparisons (memory, packaging, power) rather than model-benchmark comparisons.

From the signals. DeepSeek orders 160,000 Huawei accelerators — for inference, not training. TrendForce: Chinese accelerators to take 90% of the domestic market. Taiwan indicts nine over alleged AI server diversion to China.