R9 280X and R9 270X are taking advantage of some process updates; not ones that require new masks, but the product definitions are now optimized for the process changes. R9 270X also has a new PCB layout for optimising the memory performance and getting that PHY up to 5.6Gbps.
As for the "Islands" (and putting so much faith in the internet rumor mill!) they are meaningless in terms of extracting an understanding of the IP set. Anandtech has posed some time ago that Oland is based the same IP sets as R9 280X/270X.
As for the "Islands" (and putting so much faith in the internet rumor mill!) they are meaningless in terms of extracting an understanding of the IP set. Anandtech has posed some time ago that Oland is based the same IP sets as R9 280X/270X.