How has China developed its own 7-nanometer wafers despite US sanctions?
— China has successfully developed its own 7-nanometer wafers despite being sanctioned by the US, and they have access to lower-level deep ultraviolet exposure machines.
What is the impact of the US blockade on China's ability to purchase EUV machines?
— The US blockade prevents China from purchasing EUV extreme ultraviolet exposure machines from the Netherlands, but they still have access to lower-level deep ultraviolet exposure machines.
Can TSMC still sell older machines to China for producing 7nm wafers?
— Yes, TSMC can still sell older machines to China that can produce 7nm wafers, despite the export control list.
What is the situation with DUV machines in China and Taiwan?
— China heavily bought DUV machines before the US export control list was implemented, resulting in an overwhelming amount of DUVs in China, while Taiwan's Samsung and TSMC also purchased a significant amount of DUV and EUV machines.
Should there be concerns about Huawei's 5nm chips?
— No, there is no need to panic about Huawei's 5nm chips as major wafer factories have already reached the limits of DUV technology at 7nm, and SMIC has already produced 7nm mining chips.
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