GPU-Z displays Thaiti die size as 365mm2. But AMD official press release says 352mm2.
http://www.amd.com/us/press-releases/Pages/amd-launches-worlds-fastest-2011dec22.aspx?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+amdpressreleases+%28Press+Releases%29
http://www.amd.com/us/press-releases/Pages/amd-launches-worlds-fastest-2011dec22.aspx?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+amdpressreleases+%28Press+Releases%29