Wouldn't you also need other higher-end components to interface with and support higher bandwidth to effectively make use of all of that VRAM?
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Yes. Realistically you'd just go with higher density RAM chips, which I'm guessing are gonna be more costly per GB as well...
But the upshot for a manufacturer for higher density memory, if the 'failure rate' of fresh parts is the same, well it's better to have less parts of a fixed failure rate ofc.