> How do tariffs affect finished graphics cards assembled in China?
It's largely complicated.
What is assembled in China? A graphics card (or anything) is made up of many smaller parts. Some of it might have US-based parts, made up of non-US based parts. Tariffs happen on import (when someone buys something). So for each part this would need to be paid too.
That aside, if you ask me, the cheapest way is to get rid of US jobs. Remove the US parts so you have a 100% non-US product. 0% tariff so far. For US-only sales have it assembled shipped to a country like Singapore or Australia with 10% tariffs to package and re-label. When you ship from say Singapore to US, the buyer fills in the tariff code with country of origin Singapore. Case closed. 10% tariffs.
i.e. are you sure US wins?
What's next? Inspect every import to verify its country of origin? It'd clog up the ports.
Since Trump's 1st tariff on China, 100s of billions have been imported without tariffs. It's happening and continues to happen.