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Samsung's press release for 24Gbit GDDR7 said they're ready to produce those ICs in early 2025.
The launch batches of RTX 50 cards were being made in Q3/Q4 '24.
https://semiconductor.samsung.com/news-events/news/samsung-develops-industrys-first-24gb-gddr7-dram-for-next-generation-ai-computing/