Prices of 8GB of memory have dropped considerably. It will cost ~$30 extra for an additional 8GB. It likely less as AMD buys in bulk.
- You should separate the parts cost from the final cost to consumers.
- The recent article about falling GDDR6 prices looked only at 8 Gbit dies, but what you'd want is 16 Gbit dies.
- I think the prices already were probably in quantities of 10k. You probably don't save much more by ordering even larger volumes.
- I think AMD isn't buying, but rather the board makers.