不知是否真的是 South Island 呢
沒有出處的中國網站常常亂湊阿
看老外的新聞是:

In another demonstration of silicon health AMD was showing working 28nm mobile GPU silicon running Dirt 3. It's too early to talk about performance or specifications, but AMD is still committed to a Q4 release for its 28nm GPU lineup.

28nm, South Island, HD 7000M 這三者不必然有關係
尤其是N/A的mobile GPU命名哲學都很亂, 高中低階可能都是不同代晶片
搞不好 HD 7000M 也有一部分是 28nm 的北方群島