I guess since the memory on the 8GB cards is clocked slightly higher it's a binning thing? Though that doesn't explain why the fuck they would ship them with all 8 GB of memory.
Edit : read more, it apparently only applies to the earliest runs of the 480, which was the versions sent out to reviewers. Why they sold some of those as 4 GB models when they have 8 GB on the board makes no sense, but w/e
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