Copy pasta from LTT forum, credit to Tech@Fanatic. AMD taping out successor to Tahiti and probably Hawaii. Watercooler out of the box?
NOTE: No site has reported on this until now, so this is essentially
breaking news. I expect WCCFTech to pick it up very soon.
UPDATE:
VideoCardz &
WCCFTech picked the news story up but I'm happy to announce that we've beaten them to the punch!
This leak is very interesting, the source is not AMD or any of its board partners, it's actually not really a leak either.
Synapse Design is a company that offers services such as software and development SDKs to help companies like AMD design floor plans for chips. These floor plans are then used to start manufacturing the chips at third party fabs such as TSMC & Globalfoundries.
When a floor plan is finalized that's labeled as a "tape out" in semiconductors. Well Synapse Design just recently released a list of the chips which have been taped out in the last 12 months by a number of their partners.
At the top of the list are two VERY interesting chips, both of which are large GPUs.

Synapse Design only has one client which makes GPUs this large & that's AMD.
http://www.synapse-da.com/Corporate/ClientsTo put this into perspective the Hawaii GPU powering the R9 290X is 438mm² large & the GK110 GPU powering the 780 Ti is 551mm² large.
According to Synapse Design they have taped out a 500mm²+ GPU & a 350mm²+ GPU.
AMD's largest GPU ever was Hawaii so AMD has never designed a GPU this large before so I'm very interested to see the implications of this.
These two new GPUs might very well end up being AMD's upcoming successors to the 290X and 280X, presumably the 390X and 380X.28HPM is a TSMC node so these are not the GPUs which AMD
reportedly intends to build at Globalfoundries.
The alleged time frame for these chips' release is the second half of 2014 up to the first quarter of 2015 (July 2014 to March 2015)..